That's kind of funny: I just downloaded FC10/64 (one dvd) and even though the md5 sum is wrong, it passed the intial media check and everything has been fine.
If you're new, don't worry about bad checksums, it's almost the norm for them to come out incorrect.
I'd also note, however, that when I booted the dvd the media check was optional. If you do do it and it passes, the installer still does something wrong so you have to reboot (I can't quite remember what, but I do know this and some other little glitches seem to have persisted with the redhat installer for the years that I've been using it). I don't know what happens if the media check fails...my point is the fedora installer is not half as functional as fedora itself. In fact it's a pathetic mess.
For example, if you install with X and absolutely nothing else, you need like 100 gig of space. If you install with an absolute minimum (no X), then install X from the .rpm's yourself, by the time you've got a functioning desktop, your drive will still only have about 10 gigs on it (eg, right now mine is at 15 GB).
I would love to know what all that other garbage is/was, but I guess that's another topic. It's a shame that new users basically have to "eat it" this way.