Dear Philip,
from what I can see Trillian is running circles around GAIM and its feature set. Check the official description on the GAIM site. It says:
"Gaim supports many features of the various networks, such as file transfer, away messages, typing notification, and MSN window closing notification. It also goes beyond that and provides many unique features. A few popular features are Buddy Pounces, which give the ability to notify you, send a message, play a sound, or run a program when a specific buddy goes away, signs online, or returns from idle; and plugins, consisting of text replacement, a buddy ticker, extended message notification, iconify on away, spell checking, tabbed conversations, and more."
Is that what you are referring to?
Where is in GAIM support for RSS, video and audio chat, Time Travel, Wikipedia integration, Alerts and all the rest?
Please point me to the URLs where these features are documented.
As I am running a copy of GAIM too, I have nothing against this little gem, but I honestly see no comparison in the number of features and abilities between the two.
As a matter of fact I have chosen Trillian after having run side by side, GAIM, Jabber and Convoq ASAP. Though at the time (about a year ago or less) Trillian didn't still have as many features as it has now, I had no doubts that this would have been my program of choice.