Travel and photography blog by Geoff Panek
In my mind, for any business or serious blogger WP.org is the obvious choice over WP.com. The power of open source code and access to 25,000 plugins via .org WP sites certainly outweighs the maintenance free slight advantage of .com WP. Here is a good graph created by WPMU.org showing the differences.
I just found out about this site whatwpthemeisthat.com where you can put in the url of a wordpress site and it will tell you what child and parent theme it uses, where to get more info on those themes and all the plugins used on the home page. Check it out!