ISBN.nu: Find the best price for books online

"This site provides price comparisons among over a dozen online stores that are either booksellers, auction sites, used book dealer networks, or a combination of two or three."

(tags: isbn.nu books bookstores leadersedge)
TwittEarth :: Live Twitts all over the world

A Twitter visualization. There are quite a few of these around, but this is the most polished I've seen...

(tags: mashup twitter maps visualization flash earth web2.0 3d)
britannicanet.com

A program for web publishers, including bloggers, webmasters, and anyone who writes for the Internet. Complimentary access to the Encyclopaedia Britannica online and, if you like, an easy way to give your readers background on topics you write about.

(tags: reference blogging encyclopedia blog widgets research britannica)