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This is a "shotgun" style of microphone. I have not used this personally but have had students that have had good results with it. You can get it with a hot shoe and shockmount.
This is the one I use and I love it. When I need to "run and gun" without time to use a good laviliere microphone, this gives me professional broadcast quality. It is particularly good for interviews in crowded situations and keeps ambient noise to a minimum.
In wireless systems you get what you pay for. A good wireless lavaliere mic is an essential part for any documentarian. I love my Sennheiser Evolution G2 100. Now, here is the rub. No one has any idea how long these frequencies will remain unpolluted. UHF has been the best frequency to use to date, but I still run into interference on shoots. There are newer mics that use bluetooth but I have not seen them work and their range is fairly limited. There are newer (and cheaper mics...Samson, for instance) that I have not tried. But make sure you test in post before going with just any mic.
If your camera does not have XLR inputs you will need to get an XLR to 1/8th inch adaptor. i had mine built, but decent ones are now available for under $20. You need to be careful though, the mic inputs to most cameras are pretty fragile. I will usually tape the cable to the hand strap to prevent any mishaps to my input when someone trips over my cable!  This link it to the Shure mini to XLR to 1/8th inch jack that is both an adaptor and a line matching transformer which REALLY helps to get clean audio to your camcorder.
Well, if you want a USB mic, this is OK
LOVE these! Though small, they do not trip breakers and produce good tunable light for interviews in the home and field. I have a set that is battery operated which is really great in the field.
I have several of these in different brands/surfaces...as important as light itself.
  Hard Drives
You need a drive that spins at 7200RPMs, have AT LEAST 8MB of cache, be firewire 400/800 (USB does not work). I have had good luck with WesternDigital and Seagate Drives. It is cheaper to build your own, and is not that hard to do.