You should be able to find kits like this, or if your budget is smaller than the price on kits maybe they'd at least help you get some ideas.. Not that I particularly have any experience with any particular aftermarket products or know much about this one in particular, but it seems like it should be easy enough to find something like this:
With the cable kit and latch kit, you should be able to set up what you're looking for.. I'm sure there's other options out there, possibly even something more specificly tailored for whatever it is you've got. I just found this place with a yahoo search for "hood remote release kit" There's definitely plenty of places with these kind of products for doors and trunks...
The one thing you must be sure isn't compromised - make sure you still have a safety catch. You don't want to have the hood fly open while you're driving down the road!