[keefe]

Grad school is writing and reading papers, not writing code (most of the time). Learn LaTeX and subscribe to ACM digital library and get to reading. You're expected to have programming skills in advance (at least where I went) but you should be language indifferent. Read SICP and learn the basics of C, C++, Java and Python.

[dpritchett]

I'll second this. If you never get into LaTeX (I didn't) you'll always feel vaguely embarassed when showing your .doc thesis alongside the LaTeX formatted papers presented by your peers.

Now that I'm out of school it rarely comes up but while I was working on my Master's it was a constant irritation.