I was wondering when one would use each of the available rendering codecs? Also, is MPEG4 and H264 the same? How would I render these? How would I create Flash media from Vegas?

Thanks

There is no tutorial, I can't see much of a benefit in having one, to be honest. Doesn't matter whether it's Vegas or any other NLE, most of the standards apply across the board

SD DVD-MPEG 2 only.
HD on a disc (Blu-ray) AVCHD, MPEG 2, VC1
Broadcast HD delivery-HDCAM, D5HD, HDD
For web-WMV, WMVHD, MPEG4/10 (same as H.264)
For DV-NTSC or PAL (depending on the origin) DV codec
For export to compositing tools-depends on the tool. Might be 4:2:2 YUV, might be sequential PNG or TGA, or uncompressed.
For iPod, MPEG4/iPod template
For PSP-MPEG4/Sony template

These are the biggies. The rest of em' are more esoteric, specific workflow oriented that vary as much as the colors of blue in the sky, and there are few hard, fast rules once you start getting into unique workflows.

AVC (H.264) is "part" of MPEG4. If video is MPEG4, that does not necessarily mean it is AVC (H.264).

It depends how you want to export. I have here a 720p HD exporting guide for PS3, Xbox, Vimeo etc.
http://eugenia.gnomefiles.org/2007/11/09/exporting-with-vegas-for-vimeo-hd/

That's exactly the kind of info I'm looking for. I just can't seem to find this stuff anywhere.