Yeah, some WD40 should do the trick. Spray the hood lock mechanism liberally and close and open it a few times. This has happened to all of my cars at one point or another - you pull the release lever inside, and the hood doesn't come up that first inch or so, or it does, but the lever under the hood gets stuck. WD40 is all you need.

Speaking of which, has anyone else heard this line:

"You only need two tools to fix anything: WD40 and duct tape. If it's supposed to move and doesn't, use WD40. If it's not supposed to move and it does, use the tape."

:-)