Here at pingVision we've largely switched over to making all of our clients' websites with Drupal 6 - there's a number of advantages in doing that, but sometimes there's one major disadvantage: The website they want would be great with module X, but module X doesn't have a Drupal 6 version yet.
In those cases, we convert 'em ourselves, and post a patch appropriately. I wrapped up updating the wonderful Invite module to Drupal 6, and that made me think back on the various updates we at pingVision have done so far:
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