It appears that some number of userpics may have been lost. We had a disk failure though we did not expect to have any userpic loss as they are supposed to be replicated over several disks. However we have received a report of a user who has lost some userpics. We are looking into why they weren't. We are very sorry for the inconvenience that this has caused.
I hope they're recoverable though. I had some really awesome icons on here, and it's not my only one to have lost icons.
Either way, I'm sure Squeaky'll figure out whatever the issue is. :)
Now get on AIM or something.