[grn]

I'm using Kindle (+ Readability) + printouts. I really like books but they have two disadvantages: they are a little bit more expensive (but that's not the rule) and, what's more important, they occupy space on a shelf. I have a small collection of about 60 books and have no more space available.

When I find an interesting article that I'd like to read I add it to Readability. If the article requires more mental effort to understand, or when I want to have a deeper understanding of the presented topic, I print it on A4 paper, one-sided. The back side of each sheet is for my notes. Because I'm not trying to formulate the Fermat Last Theorem the margins are too narrow. ;-)

I think that Kindle is a good choice for tech books, but you may have trouble reading code or complicated diagrams. It all depends on the type of books you intend to read.

I recommend a mixed approach: Kindle + printouts + books. Discover your own preferences for medium for reading about a particular subject.