It looks like half of the readers of my blogs (i.e. Davis County Watch, and Farrer Commons) are using Internet Explorer version 6 which means that they are probably not taking advantage of R.S.S. There are plugins available to allow I.E. 6 users to see feeds.
There are a few that have made the jump to I.E. 7 which has a built in R.S.S. feed reader. Although, I haven't heard great reviews of version 7 itself.
About 30% are using some version of Firefox which has a number of R.S.S. feed readers. I use Sage.
I'm sure that Safari users have Feed readers. However, I've never used Safari.
If you don't use R.S.S. and are an internet information junkie, then you should get yourself a feed reader for R.S.S.
R.S.S. stands for Really Simple Syndication and is the best way, at present, for keeping track of all of the websites that you frequent. If you don't want to have to trouble yourself to visit each and every website in turn, that you like, to see if they've been updated then you want an R.S.S. reader.
Only a small number of websites don't use R.S.S. feeds. All Blogger blogs have an option to publish feeds.