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A free service that lets you create maps of datapoints either as markers or to illustrate trends geographically. Allows you to pull in data from various sources and allows collaboration on the maps. Interesting service.
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A tool that will generate browser specific CSS for you and package it all up in a C# HttpHandler (ASHX) so that it will deliver only the CSS for the browser that makes the request. Interesting idea to get around having to use browser hacks and still have all your code in one file for easy maintenance.
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A service similiar to Twitter, but probably more like Pownce, that enables microblogging and filesharing with people.
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A few of these are obvious (in the sense of "why didn't I see that before"), and a few are counter-intuitive (don't overdo accessibility features). Good stuff to keep in mind for user experience design.
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Great list of CSS tools, tutorials and generators. Good resources for web design.