Know of any?
...vague question. Do you mean to host a blog, OR to read stuff?
Hosting...wordpress / blogger are the two best, imho.
To read stuff, well, depends on what you're into :) I like searchblog a lot and read stuff like AVC, and a few others.
some people create myspaces strictly to blog, livejournal.com,blogspot.com,vampfreaks.com[[if your into the vampire or goth scene]],xanga.com is a very popular site for bloggers too.
livejournal.com,vampfreaks.com,xanga.com,blogspot.com or you can make a myspace strictly for blogging.
id like to...start one. so...host I guess.