definitely do your forearms, man. i have no idea why people seem to neglect them. it's one of the most visible group of muscles. even if you have a t-shirt on, your forearms are visible. i do my forearms just like i do any other muscle group. no need to go overboard on 'em. however, you can probably do them more often than other muscle groups because the muscles are smaller and probably recover faster.
that said, i do 3 forearm exercises:
first i do preacher curls with an overhand grip. that will get the top of your forearms towards your elbows.
next i do palm up wrist curls. basically, i sit down on a bench and roll a barbell up and down my palms. i start with it along my fingertips and curl my wrists all the way up. let it down slowly and repeat. this will get the middle of your forearms on the underside.
the last exercise i do is similar to the last one, but i do palm down curls. it's kind of like revving a motorcycle. this will get the little muscles on the top of your forearms near your wrists.
do these and you'll be all set!