So two guys at the company I work for just quitted, We were 4 in the "dev" department, 2 front end and 2 back end, now we're just 1 front and 1 back, should I try to get a raise?? I've been working steady for 8 months now.

If your boss is asking you to work harder, then yes.

Or you could tell him why they left, and say it bothers you too, but a raise could make you forget about that!

@SIMMORSAL Sounds like a good idea!

If you're doing more than your contract states or getting more responsabilities than you should have, it is a good ideia.
Just put the reasons why you want the raise in a formated document and pratice some speech before the talk, bosses are usualy very evasive.
Remember that getting a raise is not a shot and miss thing. It's more like a marathon, where you'll need to talk more than once about the subject and show more and more why you deserve it. Talking from experience.

I would not consider asking for a rise basing on how many people work in my dept.

Base your request on performance. Ask for a periodic review, talk about what you achieved *even thou* there are 2 ppl less in the area.