Actually, we tried to switch to AOLserver 4.0.8 yesterday but the site crashed after about 10 minutes. C.R. Oldham was having trouble with his site yesterday too, and I noticed some restarting going on with one of my sites today.
In C.R.'s case, and apparently mine also, the problem was that old browsers with 40 bit encryption were causing nsopenssl to crash, taking nsd with it. Dossy has a fix for that which we are testing and it looks good so far. I don't know yet whether the crash we had yesterday at Sloan was caused by this or not, but hopefully we'll have it sorted out soon.
