This blog presents examples of how GIS is used in the scientific community. I like this blog because I often find the applications of GIS to scientific problems quite interesting. It also has basemaps for several of the planets in our solar system, as well as many other minor celestial bodies in our solar system.
This blog is a good example of personal profile for a GIS professional. In addition, it provides links to many useful GIS resources.
A very interesting website for weather visualization for the whole globe. Choose from more than 2 (!) numerical weather models to display host of different meteorological variables in real time!