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If you want a shoulder bag that will also hold the rest of your gear the TT & Crumpler options are top notch. If you want a sling/backpack the Kata 3N1-30 will hold it as well as well as a ton of other stuff.
If you just want to carry the 70-200 camera mounted, I've been using the Think Tank Digital Holster 50 and like it a lot. If I'm just shooting with the 70-200 that day I'll carry it. Downside is there's not much storage space for much else beyond a compact flash sized holder. But it'll fit the 70-200 with hood on, there is some space at the bottom you could toss filters (although I'd protect 'em) & if I want an extra lens, tele-converter or batteries I'll put it in a coat pocket, although I can fit a 1.4X TC mounted as well w/o issue.