I purchased a DigitNow! Video Capture Device to use as a P2 card alternative. It works at 720P with a Panasonic AG-HVX200 Camera. You have to select the input every time you turn it on. It has built in RCA jacks that makes connection it to the camera easier and more reliable. It also has a wired remote "Record" Button. It costs about the same as a Panasonic P2 card but can work with any USB memory stick.
Here is the video recorded on the DigitNow! recorder.
Here are front and back views of the DigitNow! video recorder.