Well I just recently added 2 Instant Messenger apps to the PPCKitchen OEM thread: Slick Messenger and Palringo
I haven't heard of anyone trying Beejive/Jivetalk yet, but if its a popular enough messenger I can try to OEM it and see how it runs. As far as the .NET and SQLCE, both those are available in BuildOS.
Edit: Beejive OEM added to PPCKitchen OEM thread, untested at this time however. Also see this thread on the woes of
Beejive/Jivetalk , it seems to be an issue with the version of SQLCE it uses.