The one I bought in 2009, along with my Nikon D90 and SB-600 Flash, is the
Stroboframe Pro-Digital Folding Flip Bracket. It does fold down to be fairly compact in my camera bag. I like the comfortable padded grip, but the flash pivots on the wrong side to flip above the lens when the camera is rotated the
normal counter-clockwise direction for a vertical shot.
EDIT: I also found and ordered a bracket that does pivot the correct direction, the
RPS Studio Stealth Bracket RS-0412N. It folds very flat, but it's fairly long, and the grip isn't padded like the Stroboframe.
Take Care,
David Baldock