Partial System Freeze - ssh remote login still works

Hi,
I have experiencing the following odd thing several times during the past three months:
Out of a sudden, my system stops responding. I can move the mouse but cannot click anywhere or use the keyboard.
The system beneath seems to keep working normally, as to say, iTunes keeps playing, Mail is receiving Mails every 5 minutes (i get the mail received sound). But I cannot do anything with input devices - not with external nor internal ones on the Mac Book Pro.
I then turned on SSH access and when it happened again, logged into my account from another computer.
I ran "top", but it showed no frozen processes whatsoever.
I tried restarting SystemUIServer, which had no effect, then restarting WindowServer, which logged me out and in, so everything worked again, but my work was lost, because all programs where closed (obviously).
After login, I cannot find anything in console.log or system.log besides the ssh login and the restart of windowserver/loginwindow.
Since I have a lot of background processes (esp. vmware and parallels drivers) it is hard to tell if any of these have to do with it. On the other hand, I have not been installing new persistant stuff during the last time.
Has anybody experienced such a thing?
Thanks a lot
Simon

Problem does not occur with 10.5

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No, that is just showing the grep process... I fit was running, you'd get
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Partial System Freeze - ssh remote login still works

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