Save your chat logs; they're being deleted in patch 5.0.4
If you're diligent in your record keeping where WoW is concerned, you probably have a bunch of saved chat or combat logs in your Logs folder. Well, back those suckers up, because when 5.0.4 hits, all of the data in that folder is being deleted. Nethaera provided this helpful notification on the official forums:
It's not like saving them is a big deal, of course -- you can just move them to a new folder and you're fine. Good on Blizzard for letting us know, at least; now everyone can save their combat logs from Molten Core and their extended ERP sessions in Goldshire or whatever.