[Kipper is King]

I have the Sony Reader Pocket Edition, and I love it for it's portability. It also is snappy, considering it has an E Ink screen.

The nicest thing about the Sony Reader is that it supports the most formats of any reader. Loading Word documents and PDFs on it is easy.

That being said, I bought my Sony Reader before they dropped the price on the Kindle. In my eyes, it's a tough choice between those two.