What is Little Endian / Big Endian in Sound settings for Apple Intermediate

Hi.
In Final Cut Express, I am trying to splice together multiple video clips, combining footage from:
1) HDV camcorder imported into iMovie 08 as 960 x 540 (the "lower resolution" option from iMovie '08 import), 16-bit @ 48 KHz (Big Endian), 25 FPS
2) AVI files (DiVX 512 x 384, MP3 at 44.1 KHz, 23.98 FPS)
3) Canon Camera "movie" files (Apple OpenDML JPEG 640 x 480, 16-bit Little Endian, Mono @ 44.1 KHz, 30 FPS)
Questions
1) What is this little endian / big endian thing?
2) What is the best codec for me to edit in? My targets are NTSC DVD and also a HD version served via iPod connected to HDTV.
I am not sure what codec to convert everything to, so that I can edit without having to RENDER every time I do something. I tried to export using QuickTime Pro to convert to Apple Intermediate Codec but am not sure about the option for "Little Endian" (I am using an Intel Mac; I assume I do NOT use little endian? Can someone help clarify?)
Many thanks!!!

1. They're compression formats. Different codec use different compression schemes.
2. You should convert your material to QuickTime using the appropriate DV codec and frame rate.
None of your material is HD. Some of it is low resolution, lower than even DV. There is no good way to make this material HD.

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