Here's a handy widget: Daylife Labs offers up a tool to build custom topic indexes, based on its own collection of thousands of RSS feeds from news sites and blogs. These Flash widgets track changes in the appearance of various terms in this database, offering a basic version of a personalized information topsight tool. They're easy to make -- here's one I whipped up quickly:

The widgets can hold up to 15 different search terms, and the search engine logic is decent (including AND/OR/NOT, wildcards, and title-only searches). Here's an OtF technology widget:

Seems like a fun tool.

(Thanks, Violet Blue)