Well... I thought it might be a good idea to create a thread where everyone could kind of pool their info and talk about some tips to doing well.
I'll start it off... Feel free to add on to what someone's already posted.
Stealth
Not something I see used a lot these days, and it's not as big an element in the SWBF franchise as I'd like (play SOCOM and stealth is key). It works best on the forest-type maps (Yavin, Dagobah, Felucia). Pretty simple concept: avoid being noticed by the enemy. Even if you see a few guys you know you could easily kill, don't do it if it'll blow your cover. If you're sneaking around to a team's base or something, the last thing you want to do is have them know where you are and come chasing after you. Keep in mind that people can see you on the mini-map if you're close, and the big map if you're a little farther (Just hope nobody close thinks to do that). It's also not a good idea to leave traces behind. Don't leave random mines or detpacks in places, that'll clue them in that you've been there. Also, if you're an engy and you see a mine, just think before you disable it; a player on patrol may notice that someone has destroyed his mine and he will alert his team to your presence (or just hunt you down).