Is anyone in the whole world still using iCal Birthday Shifter? Apparently so, which is strange given that iCal in Tiger can grab birthdays from Address Book itself (iCal Preferences -> General -> Show Birthdays calendar).
Anyhow, I hereby summon the Power of Pagerank to tell all future searchers for Shifter that it now resides at the iCal Birthday Shifter page at the (currently still heavily under construction) Magic Aubergine site, and runs on Mac OS X 10.4 or later. Source included with the download.
That is all.