Never, EVER turn on "Jumbo Frames" on a Linksys SRW2048 switch.
Something overflows in the firmware, and things get very screwed up, very quickly.
Lost a few hours work for EVERYONE because of this. 8(
Update: January 10, 2008 - As noted in the comment below, I should have added more info. I've since learned that turning on Jumbo Frames is NOT a plug and play operation... ALL of the devices that might see a jumbo frame need to be able to handle them, or they will go off line.