[CentOS] Out of memory problems - some interesting log file entries

This is a newly installed server running CentOS 4 with all current updates.  
It's been cruising nicely since installation a week ago until this morning.  
Then everyting started timing out and the attached messages appeared in the 
log (this is a short and sanitized extract).  Load went sky high.

Had to reboot to restore service and all looks happy again now, but if anyone 
can provide some input on these messages...

TIA
Brian
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