About a week ago, I tried to configure GnomeMeeting, to see if I could get it to work. It didn't like my sound card, so I gave up on it.
Since then the PC had been getting slower and slower and I couldn't see a reason why.

Then, this morning, Evolution refused to open and several windows froze. Thankfully I still had the mouse, so I xkilled* everything in sight! (*Lovely program, almost makes you look forward to the odd freeze!)

Even after all that it was still grinding to a halt. I got as close to a BSOD as I think Linux is capable of getting.
Eventually I managed to log off and to my surprise I found 3 (yes, 3) copies of GnomeMeeting running in the background! No wonder I was having so much trouble.

Finally, everything seems to be back to normal now.
(Note to self: Consign GnomeMeeting to /dev/null)