Well, the business I'm in is related to this technology, software not hardware, so I'm no expert on what to buy. New ones include the Kindle, and the Sony product, just out, both of which I've seen.

I'll tell you what I do (but I'm a geek, so this won't suit lots of people.) I use the Mobipocket format, and read them on my Palm. I've been reading ebooks on a Palm for years, but things have improved with the higher screen resolutions. Mobi's not perfect, and it doesn't look beautiful on a Palm like the other proprietary ebooks, but it has this one advantage--it is small, and you don't have to carry yet another electronic device.

There's also a decent ebook format for Pocket PC's as well, the books actually look prettier than Mobi, at least on a small device.

I've got about 5 ebooks on my Palm right now.