[soulfuldog]

I had a cover and a sleeve for my Kindle 3, but only used them when carrying it outside. Don't have a cover for my PW, and probably won't bother buying one. I bought a decalgirl skin for it instead (though for the price I felt it should have had a little cushioning effect!), and if needed I'll just use my old Kindle 3 sleeve with a bit of cardboard to protect the screen when taking it anywhere. I generally prefer to hold the Kindle minus a cover, it just detracts from the small & light feeling of the ereader if you bundle it up in a cover.

I do however have the official Sony cover for my PRS 350, and its never removed. It's still small and light enough to do that, I really love it for it's portability and size even with the cover.