A blog (a portmanteau of the term web log) is a personal journal published on the World Wide Web consisting of discrete entries ("posts") typically displayed in reverse chronological order so the most recent post appears first. http://en.wikipedia.org/wiki/Blog
http://en.wikipedia.org/wiki/Blog
You can find a huge range of blogging resources from Cybraryman's Blogging Page
Reading Blogs
We recommend using Google Reader to aggregate and access the various blogs you read.
There are also some great iPad apps for accessing Google Reader.
Start Your Own Blog
Blogging Platforms
http://www.flickr.com/photos/wakingtiger/3156791845/