Footprints
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Ermine prints on my stoop this morning.

Ermine prints on my stoop this morning.

One of the really nice things that Drupal 7 added for administrative users is the machine name field. Instead of trying to generate a unique name or figuring out which characters are randomly allowed it just does it for you. Keeps the progrmamers happy with unique key names in the database and doesn't make you feel like you're trying to create a bank password.
Drupal 6 does not handle non-local files well. That means if you want to use something like Amazon's S3 file service you are pretty much out of luck. Media Mover got around this by overriding some templates but the implementation did not work well for extensibility and left most use cases in the dark.