Trendsmap is a slick Google Maps - Twitter trends hybrid
This isn't just another boring Twitter-Google mashup, though. It's got some added explorational sizzle. Click on any of the tags, and the introduction window you see in the screenshot will change to a topical display. The box contains not only relevant updates, but also displays the tag's 7-day local and global popularity, images and videos which have been mentioned, and popular topical links (see inset).
Trendsmap's toolbar is minimal and includes only five quick-access items: zoom in and out, snap to your city, snap to your region, and show the globe. I'll go out on a limb and say that the snap buttons will work for those of you in more cosmopolitan areas.
For me, however, they didn't. Instead, they both returned me to a moderate level zoom of the US and Canada. I know I live in a small town, but I'm sure Manitoba IPs are identifiable and my town does appear on Google Maps. Hopefully as Trendsmap improves minor glitches like this will be addressed.
It's interesting to me to notice the gaping void straight up the middle of North America. Apparently the heart of the continent - from Kansas up - really doesn't do enough Twittering to make waves in the trending pool.