Tomorrow, I'll have a short look at implementing Hyper Threading support - not the full monty, but it would still be nice to have it start using the two logical processors in my system; after all, I bought this system with enabling Hyper Threading in Haiku in mind.
After that excursion, I will start looking at the app_server again. I had started to refactor the code some weeks ago, but got interrupted, and didn't find the time to continue this effort. I hope to make the app_server stable in the next few weeks - it's one of the biggest show stoppers for Haiku right now: the kernel should decide when the time for a reboot has come (read KDL), not some bloody userland application :-)