Believe it or not, doing lots of browse hosts may have caused it. There was an issue we noticed with Sockets not being properly closed while doing browse hosts. I believe that's been fixed in CVS.

If you do happen to be able to repeat the problem though, please let us know what you did to reproduce it.

LOTR -- how many searches do you generally have up, and how many did you kill to reduce the memory by 100MB? When you say you cancelled some completed files, does that mean the download was still in the download table listing "Completed"? About how many of those were there? Do you know if those downloads had lots of sources while they were active?