RSS Feed Search Engines

After exploring some the the RSS Feed Search tools, I think my favorites are Topix.net and Feedster. I liked Topix.net net for searching for feeds on a broad topics such as "libraries." I liked that you could view "all topics" on one page. Once they were on one page, it was easy to scroll through or do a Control + F search of the page for a particular topic. I like Feedster better when I was searching for blogs on more obsure subjects such as "taiwanese dramas." After a few searches, I wasn't a big fan of either Syndic8.com or Technorati, since they returned 0 hits for more obscure topics and didn't seem very useful to me for broad topics but I'll continue to play with them as I get time to see if there are particular situations in which they are useful.