I bought Sony reader to read my technical books, long articles and blog posts. At first I wasn't quite happy because A4 PDF's looked quite bad - since font was really small, and if original PDF had grey font instead of black this was a complete disaster. But then I discovered PDFLRF - it just formats pages exactly for sony reader's screen. PDF's printed with PDFLRF look just fantastic - better than original book
Check out this blog for more info and examples:
It takes just few minutes to print bunch of websites into pdf and then convert them for sony reader (I usually do it in batches
Now I wouldn't change my Sony Reader for anything - it fits into my pocket and I can read whenever I want - it's just brilliant!!!