If you enjoy first person shooters, jetpacks, and free games I suggest you check out Tribes: Ascend ASAP. Seriously, it's a fun game that is in free open beta. I downloaded it the other day and had lots of fun.
This isn't the first games I've played from the Tribes series. Out of Tribes 1, Tribes 2, and Tribes Vengeance I have played Tribes 2 exclusively for the last couple of years. I always encouraged my friend to get into it with me but they always criticized it for it's graphics, learning curve, or inability to be "fun".
Tribes: Ascend on the other hand offers fast paced, Tribes iconic action (jetpacks and skiing provide the mobility to the game that must be mastered in order to play well) while also generalizing the game to appeal to a broader community. One of my friends that never enjoyed Tribes 2 recently tried Tribes Ascend and told me he enjoyed it!
Probably the most rewarding feeling is the fact that I've played a lot of Tribes 2 in my day and felt like I was barely average skill level based on the rest of the Tribes 2 online community. After my first match in Tribes Ascend I realized that I was already far ahead of most players in the terms of skill level, just because I am already very familiar with skiing, jetpacking, and most of all using the spinfusor.
This game is definitely worth checking out. You won't be disappointed! Link to download site below. Have a nice weekend you guys. :)