When they lack an EVF, I frequently hold camcorders below eye level, which makes it difficult to use the record toggle button that sits on the back of the camcorder. In Panasonic's SW21, a secondary record button sits on the bottom right for operation with your right forefinger.
For vertical shooting with its new Z980 IS megazoom, Kodak has positioned a second shutter button and automatically changes the operation of the mode dial to function as a zoom switch. In addition, there's a screw-on "dumb" grip--it's not a battery grip, as with SLRs--that expands the base of the camera for more comfortable vertical operation.
In a subtle but clever design move, Samsung tilted the lens on the Samsung HMX-R10. This has two benefits: it alleviates the wrist cramp you get because you're forced to cock your wrist back while viewing the LCD, and it allows you to pull your arms in close to your body, for a more steady hold, while shooting.