Let's talk Antarctica blogs.
Antarctic Journal is one of the best; it's written by a grad student studying penguin ecology. Big Dead Place is also great (but not strictly a blog); check out the stories and interviews section. Also of note but of varying quality and timeliness are a blog by the British Antarctic Survey, John Bean's Antarctica blog, a U of Delaware blog, Antarctic Blog, and Antarctica Blog.
I'm still looking forward to the SOUTH expedition blog whenever that happens.
Update: One more: 75 Degrees South. Very nice photos, as in this post. (thx, pete)
Update: More Antarctica blogs and such: UAB in Antarctica, Blog Rogers (which includes info about the book, Antarctica: Life on the Ice), Nathan Duke, elisfanclub, Concordia Base, Base Dumont d'Urville, Mr Rose Géophy CZT45, and Andrill. (thx, everyone)