Even with Froyo installed on both, the two smartphones have noticeably different flavors. The Droid 2 has the same customized user interface as Motorola's Droid X. It's essentially a toned-down version of Motoblur: It's less cluttered and intrusive, but the basic features -- the social network widgets and special navigation bar -- are still present. The Motorola Droid, by contrast, runs an unmodified, stock Android operating system.
In all the Droid 2 prelaunch discussion, one thing we didn't hear much about was battery life. According to Motorola, this is an area where the Droid has been dramatically improved. Motorola quotes an estimated talk time of 9.6 hours with the new Droid 2, compared to 6.4 hours with the earlier model. In standby mode, the Droid 2 is listed at 13.1 days; the first Droid gets 11.3.
Finally, the Droid 2 -- like the Droid X -- includes support for Wi-Fi hot spot functionality, which costs an extra $20 per month if you enable it. The original Droid, apparently due to firmware limitations, does not have this option (though it can still be tethered via USB, with the right configuration).
So there you have it: the tale of two Droids -- two very different phones with a lot of similarities. Let's just hope this story doesn't end in sibling rivalry.