Anything that will whip air into it at a fast rate will work--whisking it by hand, blender, food processor, I've even done it with just a fork before. Takes forever, but it works.
My advice it that you go and buy a beater, though. Once you need something in the kitchen once, you find you need it more and more often. They're cheap.
yes u can whip cream in a blender
yeah. I saw Emril do it on the show, Emril Live.