Finally they are here, the RSS-Feeds for every user! Typing http://www.mymapblog.com/rss/username you will find all the entries made by this user as a RSS 2.0 Feed. So you do not have to visit a blog three times a day to be up to date, but your own feed aggregator will do so for you and inform you about any changes.
For example in Firefox you are able to display your RSS-Feed as a dynamic bookmark and all WordPress Users can add their Feed with three clicks as a sidebar-widget.

This are just two examples, the use of Feeds is endless, so give it a chance.