Expect all holiday, anniversary and birthday gifts to come from Fry's Electronics or another Radio Shack-esque store. Possibly C. Don't ask. Just do it. Oh and if you really want to impress him, learn Lex, Yacc and Emacs. Demonstrate Perls of wisdom, weild VI like a wizard and explain why Linux is the only moral OS choice.
Hackers are still deep-down social misfits.
This means he'll probably play a lot of Illuminati or RoboRally instead of wanting to go out to a party or dance club. Deal with it. But that's not the point. Learn to laugh at yourself a little.