As you know I love Twitter. OK there are some things i find annoying, the lack of groups is one.
The main thing is the lack of uptake amoungst my “real” friends and colleagues. OK, this is in part due to the short sightedness of most customer sites using WebSense or proxy rules to block it. I have just been further depressed by Twitter Local a great site that shows you the geographocal location of tweets. I have seen similar sites on the macro scale, for example: TwitterVision gives you a world map with tweets appearing all over it.
Twitter Local works at the other end of the scale, you give it a location and a radius and it shows you “local” tweets. So, why am I depressed: I can only find two other twitterers within 5 miles of me!