Matt Blum's "10 Annoying Habits of a Geeky Spouse" at GeekDad is a great list. Here's an abbreviated version of it, with my comments [in square brackets]:
1. Punning [Duh. I love wordplay!]
2. Using "frak," or Klingon, or both, instead of regular swear words [Not so much, although I was once quite entranced with Tolkien's languages. I would totally learn to curse in Elvish--or binary, or hex--if I weren't already having so much fun with English.]
3. Weird or over-the-top ways of celebrating mainstream holidays [There's an abundance of ideas, but not enough implementation time.]
4. Dissecting movies [Yeah, pretty much...in addition to quoting from them.]
5. Wearing obscurely geeky T-shirts to "normal" places [I love the alpha-geek in-jokes that almost no one understands!]
6. Requiring extra room in the house for geeky things [Extra room? More like the whole house: comic books, CDs, too many computers and peripherals, tubs of Legos, lots of books and magazines--including Wired, back when it was indispensable.]
7. Geeky toys and decorations can be hard to explain to kids [Most of my über-geek stuff eventually winds up at the office.]
8. Looking up information while a discussion/argument is still in progress [Dude! I'm the poster child for this. Some days I feel as if I couldn't "remember" anything without the help of Google, Wikipedia, IMDB, and AllMusic.]
9. Needing to watch certain TV shows ASAP to avoid spoilers [Sometimes. Other times I seek out spoilers because I have to know RIGHT NOW!]
10. Geeky projects that take over the house and whole weekends [Life is a geek project. See #6.]
I would extend #10 to discuss the geeky creative sub-cultures (see Make and Craft for all kinds of examples) that are known for abundances of tools and crafting supplies, respectively. I would also include the open-source movement, which exhibits much of the same modding mentality.
I'd call the habits "endearing" rather than "annoying," but I might be biased in favor of geekdom.
Just a little bit.