yep...like CH said...Trillian can have it's relative spaces resized to your liking. I've used 'mostly' Trillian for 4-5 years now.

"Miranda" is supposed to be highly configurable if you download all the add-ons and need many tricks, but Trillian does it for me..(and it will load AIM/ICQ/MSN contacts, also...my son came home from college and couldn't get AOL/AIM to work, so I just fired up Trillian and he logged right on.)