(To convert USB camcorder .MOB files for use with FCP)
1, Connect the camcorder to your Mac.
2. Open drive that appears. Copy the .MOB files (in the "SD_Video" folder) onto your mac.
3. Rename all the .mod to .mpeg and change the extension when prompted.
5. Download ffMpegX application
6. Run ffMpegX and open the first .mpeg file. Convert this to a .MOV, .DV, .AVi file or whatever format you need. Final Cut is best with DV (although uses a lot of bytes).
7. Repeat as necessary for all your .MPEG files.
You could always use iSquint to convert to Apple TV or iPod compatible files and add straight to iTunes, or anything else you wish.
If possible, get a Firewire compatible camcorder, generally one with a MiniDV tape and use that next time.