My friend just applied adsense, and our site seems to have similar ads (ASUS) but he is getting $0.5 per click i get only $0.1? wtf??
if your friend gets more per click for the same kinda site and same kinda ad, then it is possible that you have been smart priced by google. wait for a while and see whether your friend still makes the same as he is now making (given that yuo both are doing the same thing with same kinda site)
Maybe the ads being clicked by people at your friends site is higher paying. Try it for a month and compare again the difference.