Mimo’s iMo Pivot Touch is a 7-inch USB-connected secondary monitor sporting a 800 x 480 resolution. As the name suggests the iMo is touch-enabled and pivots. Specs include a brightness of 350 cd/m2 and a 400:1 contrast ratio–both quite decent.
A Caveat: Pivoting might be cool but make sure viewing angles are symmetrical: 170/170 or 160/160, etc. If you don’t, the iMo’s image quality in portrait mode will most likely be less-than-ideal.