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>> On that subject... does Ctrl-Alt-Del initiate an orderly shutdown?
>>      
>
> If you can't log in -- even on the console -- then rebooting is really
> your only option.  Ctrl-Alt-Del should bring the system down cleanly if
> you haven't disabled that functionality.  Otherwise, just toggle the power.
>
> The symptoms you're seeing could well be due to filesystem problems or
> to some filesystem filling up (/tmp is a prime suspect) or due to
> running out of memory+swap.  Some sort of memory leak sounds pretty
> likely actually.
>
> Probably best to bring the system up in single user mode and run fsck on
> all the filesystems manually -- that will show if you've got h/w
> problems with drives and possibly with disk controllers or cabling too.
>   Then check for overfull filesystems.  You may not find any -- rebooting
> can clear a number of conditions where disk space is not released back
> to the OS properly after use.  You may or may not find any clues as to
> what went wrong in the system logs.  In the absence of any other clues,
> the only option is to monitor the server closely and wait for something
> similar to happen again.  Hopefully if there is a next time, you'll be
> able to catch it and fix the underlying problem before it takes the
> machine out a second time.
>
>    
Yes, I can't log in. I get a login prompt, but no password prompt. I'm 
going to try ctrl-alt-del and see what happens.

Crossing fingers...