Do atheists pray...

Well that's an interesting question. If you define atheist how I do, meaning someone that doesn't believe in the supernatural, I'd have to say no. No we do not.
I remember the first time I was in a bit of a crisis after I really started to not believe and felt that old reflex to whisper quietly to myself and hope that things would get better. I also remember the amusement and regret I instantly felt once that urge came up as I realized that speaking to something that doesn't exist wouldn't really help my problem, and instead did the same thing that I'd always done before: I started working to correct the situation and resolved it.
Prayer is a bit of a crutch, and a little...for lack of a better word, immature. It is the remnant in adulthood of that feeling we had as children that a parent would make everything ok.
When we pray we feel a sense of consolation because we think someone is working to fix the issue, but stop and think about your answered prayers. Think about when they were resolved and how. Was it something that would have worked itself out with some hard work from you anyway? Was it solved by the intervention of another person? Was it solved at all? If you apply these questions, and if you're really diligent about it and keep a log of them, you'll quickly realize that your "answered" prayers were resolved by something that could be explained within the laws of nature.
So no, atheists don't pray. We may hope for a resolution of our problems, but we do not foist them off on an imaginary friend and believe they have somehow been resolved.