It may not be a one-tap affair as of yet, but the DROID 2 has been rooted and you can get your hack on by following this thread at xda-developers (at your own risk, of course). You need to have the Android SDK and Motorola drivers installed. After that, just fire up ADB, enter the listed commands faithfully, and enjoy root access. Or, you could wait until someone packages this up nicely in an all-too-easy app and avoid the worry of typos and other mishaps.
Word is that the process is very similar to that of the DROID X, so a one-tap solution can’t be far behind this hack.
Via xda-developers by way of Android Police