Say I have a cool app no longer on the market and my brother who just got a dx wants it too... I know I can email apks that I have downloaded from (I sent him z4root when I couldn't find it anywhere, even couldn't find it at 4shared anymore) so is there a way to locate an apps apk that I didn't download from 3rd party?

texting and driving on my Droid X...thanks tapatalk