There’s a nifty new app out for the Mac called Skitch — it’s a bit hard to describe, but the demo video on the Skitch site does a decent job of doing so. Basically, it’s a screen capture/markup tool with a distinct Flickr, et al. aspect to it.
I managed to snag a beta invite and 5 extra invites, so if you’re interested in grabbing an advance copy, just leave a comment in the comments section of this post. First come, first served!