It's a silly crush, or crushes I guess, but I love the women of TechTV. Many of them are not only cuties, but they're smart geeks too, which is hotter than sheer physical attraction alone.
My favorite is Morgan Webb, who hosts X-Play. Other favorites include Sarah Lane on The Screensavers and Cat Schwarz on Call for Help. I also really dig Jessica Corbin on TSS, though she's less geek and more uber-TV producer. Gotta send props to Laura Swisher on Unscrewed too.
It's a great world where geeky girls can be popular and on your hot list.