The original link from the email still works, too: http://bit.ly/kbeta
. The email included this explanation:
The Motorola Droid, Milestone and Backflip are prevented from downloading non-Market applications and therefore will not be able to participate in the Beta. Kobo for Android requires Android OS 1.6 or higher. Customers with the HTC Dream, Magic and Eris or LG GW620 Eve or Motorola CLIQ or Samsung Behold II do not have the minimum OS requirements for our application. Customers with the T-Mobile G1 and myTouch 3G should be running the latest Android OS 1.6 "Donut" update from Oct 2009.
I have a Droid and know for a fact that this is not true. Don't know where they got this information. I install non-market applications all the time.