The Universal Binary for Second Life is now in alpha release. The Universal Binary installer can be downloaded at:
http://secondlife.com/community/macub-alpha.php
This alpha release operates against the main grid. As such, all actions performed using this alpha software should be done AT YOUR OWN RISK. Second Life 1.8.4.8 for Mac Intel and PowerPC platforms will be installed by the Universal Binary based on your operating system. PowerPC users must run Mac OS X 10.3.9 in order to test that version of this new Second Life client.
Please see this thread for known problems with the Mac Intel/PowerPC Universal Binary versions:
/276/aa/92215/1.html#post924407
Bug reports can be sent through the client application, and posted here for other users' information. Your testing will greatly help us get the UB out as an official release!