I started playing War Thunder, which is currently in open beta. If you've played WoWp, WT is like that, but a lot better imho. All the planes respond quicker to controls, and there are a lot of modes.
It looks and feels a lot more realistic than WoWp to me. And a specific response to one of Mav's complaints about WoWp, I shot down a lvl 15 FW-190 in my lvl 4 P-40E-1 in a historical battle. (lvl's go from 0 to 20)
War Thunder Website
Youtube Commentary by the Mighty Jingles
Does anyone else already play? If so, what's your favorite nation/plane?
I like the Russian's starting reserve I-15's, very agile, but after the lvl 1 I-153 (which is basically just an I-15 with retracting gear, it took till lvl 5 for me to be impressed by a Russian plane, the Il-2 Sturmovik ground attacker. My current favorite American plane is probably my fully upgraded P-40E-1 Kittyhawk, although I have a couple lvl 6 planes as well, and the F6F Hellcat is comparable, but has more explosives.