Here's the list:
Release Notes for Second Life 1.13.0(

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New Features:
* Added a new tab to the Profile called Web which will show a web page of the profile owner’s choice
* URLs in chat and IM are now clickable links
** Supports http:// and https:// as well as secondlife:// links
* New options in Preferences/IM allow you to log IMs and/or chat
** The log file location can be specified
** Additional option ’show end of last IM conversation’
* Notecards now support international characters
* Updated Friends UI
** Set permissions for your friends to see you online/on the map
** Conference IM multiple friends by multi-selecting in the Friends list
** See who has granted you permission to modify their objects in the Friends list
* New option in Preferences > Communication to set whether you show as online in Search
* Estate visibility
** The estate visibility concept is simplified to just access permissions
** All classifieds and events are now viewable regardless of estate location on the grid. The Teen Grid and Main Grid are still separate.
** All regions within a grid now viewable, regardless of estate
** Online status is no longer hidden based on visibility of an estate
LSL changes:
* New script commands
** integer llGetObjectPrimCount(key id)
*** Returns the prim count for any specific object in a sim
** integer list llGetParcelPrimOwners(vector pos)
*** Returns a list of up to 100 agents who own objects in the parcel, and the number of objects they own
** integer llGetParcelMaxPrims(vector pos, integer sim_wide)
*** If sim_wide is TRUE, returns the total maximum number of prims allowed on the parcel
*** If sim_wide is FALSE, returns the maximum number of prims this individual parcel supports
** integer llGetParcelPrimCount(vector pos, integer category, bool sim_wide)
*** If sim_wide is TRUE, returns the number of objects on all parcels owned by the same owner in the category specified
*** If sim_wide is FALSE, returns the number of objects on this specific parcel in the category specified
*** Categories are:
**** PARCEL_COUNT_TOTAL: all prims on the parcel(s)
**** PARCEL_COUNT_OWNER: prims owned by the parcel owner
**** PARCEL_COUNT_GROUP: prims not owned by the parcel owner, but set to or owned by the group of the parcel
**** PARCEL_COUNT_OTHER: prims not in GROUP or OWNER
**** PARCEL_COUNT_TEMP: All temp on rez prims
**** PARCEL_COUNT_SELECTED: All selected or ridden prims
** list llGetParcelDetails(vector pos, list details)
*** Returns of a list of the details (PARCEL_DETAILS_NAME, _DESC, _OWNER, _GROUP, _AREA) in the order they are in the details list, for the parcel at pos
Other changes:
* IM shows resident’s name and ‘…’ if they are typing
* Chat, IM, and script chat (llSay/llWhisper/llShout) max length increased to 1023 characters
* ‘/me’ emotes properly in IM (e.g. ‘/me laughs’ becomes ‘[your name] laughs’)
* Busy Mode message is now account-specific
* URL color is an option in Preferences
* Texture asset IDs no longer sent to the viewer unless necessary
* Adding performance logging based on agent frame rate
* A confirmation prompt now appears when emptying inventory trash
* Altered scripted movement/resizing of prims to better resemble 1.12 smooth behavior
* Korean characters should display properly on Mac OS X
* Linux client’s cache, settings and logs now live in ~/.secondlife
* Options for Proxy removed from Preferences
** These options were intended for Mozilla only and did not function
* Vehicles permitted to enter object entry blocked areas
* New README-client.txt file for Linux client
* Several viewer rendering performance improvements
* Parcel owners can block objects from entering their parcels
* Option added to allow only group members to create objects on parcel
* Fixed a simulator crash related to region for sale information
* Updated Mozilla libraries to 1.8.0.8
* Linux client now has a working crash-reporter
Bug fixes:
* You can now correctly fly a vehicle above the ban limits of a parcel when banned
* Fixed Linux crash when displaying certain UI elements
* “Upload Image” will now ignore multiple clicks to avoid duplicate uploads
* First names which are numbers will now be shown correctly in chat
* Fixed the ability for group owners to remove members from roles
* Fixed a crashing bug with tearing off menus from scripting window
* Fixed a viewer crash when right-clicking on certain objects
* Fixed a viewer crash when changing prim shape
* Fixed a client crash with ‘Hide Selected’
* Fixed a simulator crash
* Fixed scripted chat length longer than 255 characters
* Fixed URLs that wrap over two lines
* Fixed clickable area of URLs
* Fixed login screen drawing incorrectly before loading
* Fixed release of camera controls when exiting a vehicle
* Fixed level-of-detail issues in flexible prims
* Fixed tori LOD to reduce gaps
* Fixed Prev and Next buttons for Find -> People and Find -> Groups
* Fixed object size not updating with spinners or mousewheel
* Fixed detaching attachments when the parcel at <0,0,0> is full
* Fixed a client crash with textures that are not sized in powers of 2
* Fixed a client crash when adjusting cut on a multicolored object
* Fixed mouse cursor when hovering over URLs
* Fixed text that isn’t a URL becoming hyperlinked
* Fixed attachments disappearing beyond 25m
* Fixed viewer crash on MacOS when running in Thousands of colors
* Can now edit attachments even when a parcel is full
* Fixed some bugs related to banning users from estates
* Script energy recalculated on link and unlink
* Multiple inventory items opened at once open in one tabbed window
* Fixed IM Pending flashing on conversations that are already open
* Fixed Live Help messages being inserted in the wrong place in chat history
* Fixed blank low resolution terrain after clearing cache
* Fixed a cause of ghosted objects (full parcels and region boundaries)
* Fixed gestures being opened multiple times
* Fixed object buoyancy when setting STATUS_ROTATE_X,Y,and Z in a list
* Fixed reduced priority of textures in the distance
* Fixed Unicode characters in busy mode string resetting Preferences
* Fixed a client crash with bumpmaps on Macs
* Fixed a client crash with landmarks in tabbed windows
* Fixed a client crash when right-clicking a payment notification window
* Fixed a client crash for llLoadURL