These are some of my favorite reading/writing websites.

BookCrossing – release your books into the wild!
Goodreads – technically a social network, but I use it to catalog my books and reading
ManyBooks – free books
My Writing Nook – free online writing software
National Novel Writing Month – join tens (hundreds?) of thousands of writers across the world writing 50,000 words in November
PaperBack Swap – trade ’em!
Project Gutenberg – free books (also you can help edit, if that’s something you’re into)