You've Got Gmail for Trillian (New version: June 20th 2009)
Latest version : 1.0.2 Build 1002
You've Got Gmail is a Gmail notifier plugin for Trillian Pro (version >= 2.0)
Works Trillian Astra too!
You can manage your Gmail accounts, see the list of the accounts (with new emails number) in the My Mail Accounts section
of Trillian and get notified when new e-mails arrive via systray popup windows.