Milk is Tasty has a good point on the fact that storage and compression formats are different, but they are highly aligned. DV Tape uses DV compression, is the least compressed of consumer level, and the best quality, but the longest workflow to ingest in many ways.
DVD recorders use MP2 and can be the lowest quality and hardest to work with.
HD HDD camcorders tend to use MPEG 4 and h264 (both related technologies) the give great compression, but are a bit harder to work with.
Although DV can sometimes be a pain to ingest (having to playback 1:1 time from a camera), it is then the easiest to edit and splice together, though it takes more storage.
DV tape machines are dying, and will most likely disappear.
However, a proper video editing approach is to have different drives for scratch disks, and 800 is the best and fastest approach to this. Of course, the Apple bean counters want those folks to consider a MacPro or a MBP, but not all of us do this for a living, and can afford video studies.
Apple, with the MB, used to offer some reasonably priced basic approach to editing video. In adding the new video chip set, it would have ramped that up even further, however, they took away FW for reasons that we don't really no, but it sure looks like they want to force you to upgrade to the MBP now.
(as an aside: what -- they couldn't at least have added another USB port in place of the FW?) I think the MB is intentionally crippled to drive sales up their food chain. That's their choice, and they have the latitude and right to do it.
Also, on lack of FW -- maybe this also drives the need for the time capsule or other networked storage. FW drives are pretty darn fast and are great for backups. In my own real life tests, my FW drives tend to run 33% faster in file transfers. However, that has let me say "eh, I don't need the time capsule. I'm fine dragging and dropping my critical files." Maybe they know that, and would like to drive more time capsule sales for backups. Just a thought.