What would you like to use your Tool Labs account for?
I am presently working on a prototype of a "real-time editing" widget for MW specifically suited for Wikipedia (and maybe Wikinews as well), which shows a more interactive view of pages presently undergoing edits and assists with better handling of edit conflicts. This was originally going to be a Google Summer of Code project ages ago which I never got around to properly finishing. Obviously realtime replicated db access is needed for the backend PHP scripts to work properly for the js part of it to talk to.