Via a widget in my Firefox browser, Kwout does this:
That is a screen capture of a piece of my twitter page this afternoon.
I can capture a screen shot easily and quickly and make it any size I need it to be. This is done with a useful little slider that sizes your kwout so you can see exactly how big it'll be before you save/upload it--love that. They mashup with Blogger so that it's wildly easy to post to my blog. Cool thing is that it says the hyperlinks within the graphic above are still hot, although I can't tell as I type this. They're not now, but they should be once this goes live. I'll see how useful it ends up being. Like it at first blush!