Users of the Motorola Flipside have had to be a patient bunch whilst waiting for their Froyo fix; since making its debut on AT&T in October of last year, the device has been running Android 2.1 with MOTOBLUR software. Fortunately for those users, they can now upgrade to a newer version of Android through the Motorola support website right now!
According to the update page, you will need to have at least 40 MB of internal free space on your phone and 100 MB of SD card space available before getting your hands on Froyo, but the whole process seems fairly painless. You will have to manually download the update through your PC and copy it to your SD card before installing. All the information that you will need is on the support page.
If you're a Flipside user, be sure to let us know how you get on with the update and whether or not you run in to any problems. As this update is coming from the official Motorola website, there shouldn't be too many issues.