Made from water-resistant rubber and completely flexible, Scosche's freeKEY ($60) is perhaps the most portable of all of the full-sized Bluetooth wireless keyboards we've yet seen marketed towards iPad and iOS users, thanks to its ability to roll up into a 4.5"-long tube that's roughly 2.25" in diameter. The integrated battery and Bluetooth hardware are found on the left side, complete with a water-resistant, rubber-capped panel for the power switch…