I use NotesBuddy as my IBM Sametime instant messaging client for work. I find it much more flexible and useful than the default Sametime connect client (although upcoming versions of that might make me change my mind about that!). It’s also nice to have a lightweight mail client rather than running the full Notes client all the time on my laptop.
IBM recently released a new version 4.16b, with several new features.
Version 4.16b extends pioneering/persistent chat history across re-boots. See a buddy’s clock, get Web images faster, communicate with Sametime buddies inside and outside of company.