You know you are a geek when . . .
You look at a movie trailer and think, "I have that font."
You get bittersweet nostalgic feelings about your long-lost Commodore 64 (or Sinclair ZX-81, TRS-80, etc.) and use large amounts of money & time trying to track one down.
You check your web access page more than once a day.
You have more e-mail addresses than pairs of shoes.
Although vaguely insulted by pocket-protector jokes, you still find them funny.
Someone asks you what languages you know, and you reply: "German, French, Assembler, Java, and C."