Windows only (for now): Instant messaging services often have clients for multiple platforms. But keeping them open across machines and portable devices can be a nightmare: lost chats, automatic "away" statuses, different histories and so on. The latest Trillian build fixes that with a "continuous" IM stream.
What does that mean? Basically, it means synchronisation and awareness across IM clients of when you're chatting, when you're not, and what to do in-between. Having your Windows Trillian client open means that the other IM clients go quiet for the moment, but walking away and firing up, say, your Android phone, all the chats, and chat history, are instantly available. It also means Trillian handles the quirks of various chat networks, so that you're "online/available" when you want to be, and "away/unavailable" when not. If you return to your Mac notebook after using your Windows or mobile devices, it won't bombard you with chat windows or notifications — it knows you were active elsewhere.
At least that's what's happening now, with an early build of the Windows client. Trillian says continuity is coming to its other clients soon. It's a great idea to implement — inspired by an Engadget rant about the Continuous Client.
Trillian for Windows: The continuous client! (5.0 Build 30) [Cerulean Studios' Blog via Tested]