I'm pretty sure they do. Here's the post that convinced me to try it out: http://www.fourhourworkweek.com/blog/2007/12/28/12-filtering-tips-for-better-inform

I'm pretty sure they do. Here's the post that convinced me to try it out: http://www.fourhourworkweek.com/blog/2007/12/28/12-filtering-tips-for-better-information-in-half-the-time-rss-delicious-and-stumbleupon/ http://www.fourhourworkweek.com/blog/2007/12/28/12-filtering...