Ok, so I'm poking around in the new webmail.apple.com thingy, and I've noticed something strange...
I use Entourage and Mail for my mac.com email, and I have both of them set up to save sent messages in the "Sent Messages" folder. I clean that folder out now and then to save space, and have had NOTHING in it for the last 3 days or so.
So I head on over to webmail, and in my preferences, I see that I'm using about half of my 5MB limit. I check my inbox -- nothing big there. 9 messages total in there, the largest being around 100k.
So I make it list "all folders," and I see that I have 60 (!) items in my Sent Messages folder! WTF?! It seems that they've been sitting there the whole time... that Mail.app and Entourage were NOT deleting them when I deleted them out of the Sent Messages folder... even though in Mail.app and Entourage BOTH report that there are NO messages in the Sent Messages folder!
I double-checked to make sure I only had one "Sent Messages" folder, and sure enough I do. Anyone else experience this oddity?