I’ve seen a lot of mashups in the past couple of years, but the Google Maps, Twitter, and Twittervision thing is one of the greatest I’ve seen. Not only does it seem to work very well – but the mix of live results and individual reactions is simply wonderful. And the presentation of the results (on the left of the screen) is a model of simple, clean, effective design. Not super-pretty, but more effective than all the bells and whistles generally seen at the Networks’ sites.