Usefull for bullet cams, spy cans and to digitise video.

Here is a useful list.

Helmet cameras Compatible camcorders with an a/v input

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I have one prejudice - I am anti HDV for consumer camcorders.

www.zaskarfilms.com You tube channel 'zaskarfilms'
JVC DV5001e (big cam), Sony PC6E (tiny cam), Vinten pro5, PAG light, SM58, Sony ECM50, Sony C-76, 0.5x convertors for sony, Rode video mic, Vegas 7.

If you want an all-in-one solution, then I can heavily recommend the Samsung VP-X300L "Miniket" camcorder

This is an MPEG4 (DivX) camera that includes a wired external lens with inline power and start/stop controls.

One wire, no battery packs, and spits out footage that matches miniDV in characteristics (For PAL: 720x576@25FPS, 4:3 1.067 PAR - does interlaced or progressive)

See here for an example of a video made entirely with one of these.

See here for my miniket page