Coccinella is a Jabber client with a builtin Whiteboard(used to go by that name) and has VoIP features optional. A recent update made this client portable with a simple preference option. Once checked the data is saved in a folder(Coccinella-prefs) outside of the Application folder.
Get the idea now? Back to the subject.
And to make the portable feature easier to use, it comes in a nifty little zip file. Either grab the build with VoIP or the one without. I'd rather use Meebo for voice communication over the web anyway. In this case it's for those who have managed to migrate completely to Jabber and somehow convinced their contacts to follow too. I should mention the new update also comes with a sleek black skin.