I didn't preorder, but I will be getting a nook.
My 505 will be going to my wife as a backup, as she is extremely happy with her 505 and would prefer to do a wait and see on the nook (and has a fair size library of .lrx files).
Also she's pretty hard on the readers - having executed 3 of them so far. The 4th one is working but there is duct tape involved
, so having a backup is a good thing especially since the 505s are getting scarce.