OpenID

There are loads of web sites relating to Second Life out there, from shops to group forums and much more. It would be cool if Second Life residents had a way to securely and easily prove their Second Life identity to such sites.

This kind of cross-site login is nothing new. We've seen Microsoft do it with MS Passport, for example. However, it would be even cooler if it was implemented using OpenID, which is an open, documented protocol for doing this kind of thing. That way residents would be able to log in as themselves on a bunch of other sites not directly related to Second Life. Using an existing protocol means that there are already a bunch of libraries that developers can use to talk to it, too. I implemented OpenID logins into my PHP-based site in under an hour using the "consumer" library from the OpenID wiki.

The main benefit of this would be that I could join a group in-world and then go to the group's website and post in its forums as Ben Bean, and no-one else would be able to pretend to be me. The group forum never sees my Second Life password, and I don't have another password to remember.

All it requires is a little bit of extra software here on the website. It wouldn't need to impact the world at all.

I guess someone already suggested this:
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Sorry for the spam. I forgot to search first...