What Guys Said 3
It's very flattering. Tends to put a bounce in your step the rest of the day.
Its cool to me, I generally give my number/email on a card just to make it less awkward, and to prevent questions like these from showing up ;) But we'll take it, better yet ask to Facebook each other, even less stressful!
What Girls Said 1
A guy I know always types the girl's number into his phone and then dials it on the spot to make sure it's really hers. I figure he must have been duped a few times, but often the girl's legitimately given him her home number so he can call her at home and he gets upset that she's not picking up her cell. (I knew the girl in question and she doesn't even own a cellphone, which I had to explain to him later, when it was too late and he'd already blown up at her.)