Now we know how to use 
bloglines and 
feedsweep. Both site are very useful when you want to structure your knowledge. Both are a good tool to develop ict-literacy to.(same as the blogs) (let's see the uk-sites, as: 
incsub (before cald learningblog.org), and a teacher's sites: 
edublog)
We know, there are many different scope of trackback and rss.
And I find something about informal learning too, which idea is on the center of my interest, on 
swicki serach engine...