One of iPads biggest advantages in my book is 3rd party accessories. TouchPad owners should be able to take advantage of this with a lot of accessories.
I've already received one email for iPad covers that states it will also fit the 'soon to be released' HP TouchPad.
Just a thought I had. Most Droids will not be able to do the same. This is a plus when people want to have the coolest covers and such. Most of these accessories don't have anything on them that indicates they are made for the iPad either (i.e. no Apple or iPad wording).