An astrophysicist (+blogger) to be aware of

marcus

Andrew Jaffe
http://www.andrewjaffe.net/blog/

His page at London Imperial College
http://astro.ic.ac.uk/~jaffe/

Citation Statistics (see http://www.slac.stanford.edu/spires/)
Number of citations: 5952
Citations per paper: 121
Max citations of single paper: 1006
h: 26 see http://physicsweb.org/articles/news/9/8/9/

has taught Cosmology and also the mathematics and computer numbercrunching that goes into analyzing CMB. Will head a data analysis group for the PLANCK satellite mission.
Funny. Original viewpoints. Gets stuff into technorati. Must be approximately 40 years old, which is young for all he has done and gotten recognition for.
I don't necessarily agree with his attitudes as a blogger but you might want to check out his blog.