Some are established writers like Andrew Sullivan (creator of andrewsullivan.com) that now get paid, through advertisers . His weblog is quite expansive and could rival the editorial comments that are found in any widely known magazine, journal, or newspaper. Rebecca Blood of Rebecca's Pocket (www.rebeccablood.net) is another example of an established writer sharing links, commentary, as well as personal notes..
Other bloggers range from students (college and high school) to technogeeks that want to exchange knowledge.
Some sites are weblogs set up to allow people's weblogs to be linked to them for information on specific subjects. One in particular, The Scout Log, does just that and therefore doesn't have a single blogger, but many.