Check out the M.I.C CF Card Reader for the iPad 2. It’s a compulsory accessory for all DSLR users with an iPAD. The CF card reader for iPad is a neat 2-in-1 accessory. The connector can handle both Compact Flash Cards and USB drives, and is backward compatible with iPad. The M.I.C CF Card Reader supports CF cards with speeds of up to 600X. Expect to pay around $30.
iPad Supported Video Format:
* H.264 video (up to 720p, 30 frames per second; main profile level 3.1 with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats)
* MPEG-4 video, up to 2.5 Mbps, 640 by 480 pixels, 30 frames per second, Simple Profile with AAC-LC audio up to 160 Kbps, 48kHz, stereo audio in .m4v, .mp4, and .mov file formats.
* Motion JPEG (M-JPEG) up to 35 Mbps, 1280 by 720 pixels, 30 frames per second, audio in ulaw, PCM stereo audio in .avi file format .
* Supports transfer photos / videos from iPhone 4 to iPad
via the USB interface on the card reader
Thanks to @seaneternalknot for the CF iPad Reader tip.
See M.I.C for more on the CF Card Reader for iPad.