I have this uncontrollable urge to accessorize my ebook readers. I'd get a cover for each day of the week if I didn't stop myself
The Platform case looks good because it's dirt cheap and turns into a stand, means you can use it indoors when you want to cook your dinner and read a book at the same time

Their other covers seems a bit generic, but I love that the platform has a pretty unique usefullness.
Yes, it's hard not to cover buttons on the PRS-950, but for me atleast, the only button I don't want covered is the power one, so always careful about that particular one.
Thanks for the good links, sometimes I wish I lived in the states so I wouldn't have to worry about postage, could buy 3 of these covers then, one for monday, tuesday and thursday