If you've ever wanted to add a few dozen more teams to NFL Blitz 2000, you're in luck. This patch nearly doubles the number of teams that can be used, raising the limit to 60. It also region-cracks the game so PAL users won't be stuck on a screen informing them it wasn't designed for their system. As a small bonus and example of sorts, the Houston Texans have been added into the roster. There is a minor caveat, of course. You can only use the new teams in "Arcade" and "Tournament" modes, and you can't edit their plays in the play editor. Altering save files is non-trivial and wouldn't be backward-compatible.
The patch is distributed in a few formats and variations for different versions of the game. Note all varieties expect an unbyteswapped, uneditted ROM. You only need to apply one! In fact, you couldn't apply more than one if you tried. It's checksum-enforced too, so if you use the wrong one it won't even attempt to patch the game.
xdeltaA UI version for windows can be found here:http://www.romhacking.net/utilities/598/
Currently the roster editor found on this site only supports the demo ROM Zoinkity released a few months back. I Will hopefully add support for this patch shortly (next week or two). As for adding new teams support will be added in the upcoming weeks/months. Stay tuned!
Check out the read me Zoinkity supplied in the download.