Today’s featured promo on MacUpdate offers AppShelf for US$3.95 (43% off, retail $6.90). “Have you purchased applications in the last several months or even years ago and now have no idea where the serial number is? Do you find yourself digging through archived emails in search of registration info? With AppShelf you can bundle all the ‘stuff’ related to a software purchase into one place. It’s easy, just drag and drop!” AppShelf requires Mac OS X 10.4 or later.