Search tools for rss feeds

Well, I didn't really find anything useful at any of these sites. I don't really spend enough time on the net to utilize this service, I guess. Like I said in my last post, I will definitely find the rss feeds helpful for the sites that I already visit. Over time, I might just find a use for these search tools. I have to admit that I'm not really sure I understood the concept of these searches. I did a search on a subject and it brought up articles from different sites on the topic I searched. So, if I subscribe to that post, am I subscribing to that website or to any items posted in my search? I wasn't able to find any user friendly help on any of the sites that clearly described what was happening. Maybe I just wasn't looking hard enough. The Using Bloglines tutorial gave what appeared to be helpful information for feedster, but when I went to the feedster site, there had been an update and none of the screens or commands looked the same. Well, we'll soldier on.