Gaim, due to AOL's trademark on "AIM" (even though Gaim had their name first), has changed its name. The new name is Pidgin. For those of you who don't know a lot about linguistics, a pidgin is a language that is used by people who don't have a common language but need to communicate. They make a very simple mix of their languages to get the point across. Since Pidgin is used to communicate across multiple protocols (AIM, YIM, MSN, XMPP, IRC), it's a fitting name. Given the use of netspeak (wut ^? nmu? me 2), that could be considered a pidgin as well.
Libgaim's name also changed. It's libpurple. This may sound silly at first, but think about what it does. It's a protocol plugin. The standard shortening of that is prpl, pronounced "purple." Nice play on words.
And since most people are likely to think of a bird when they hear "pidgin," gaim-text is now called Finch since it's the "little brother" so to speak.
The name changes will take effect with the release of Pidgin 2.0.