I just activated my droid x from a droid 2. They seen totally identical to me. What's missing in 2.1??
I do notice that the droid 2 seemed to "flow" better as far as transitions between screens and especially not as laggy when sliding to unlock the screen.
I just recently upgraded from my o.g. Droid to the X, and my o.g. had received it's 2.2 upgrade days before I got my X so I got to play with Froyo a bit.
There are a number of differences, and correct me if I'm wrong here guys but the differences may be even greater on the X as it isn't the same device as the o.g. Droid.
First, I noticed call logs are handled differently. Multiple calls from the same contact in the same day are now "threaded" or grouped together, making them easier to locate. Second, when utilizing the search button (magnifying glass), you can click on the Google "G" and change it to Wikipedia or a few other options. Third, and one of the biggest, the option to make Flash media available is only possible on 2.2. Lastly, everything was indeed much snappier and loaded faster for scrolling. App page moved swiftly, browser loaded pages faster, gallery took less time to generate images.
There are quite a few more, but I just woke up and the coffee is still brewing.