Ok, had to replace some of my list, because H2G2 and Pride & Prejudice have been mentioned already.
So here it goes:
Measuring the World - Daniel Kehlmann (historical fiction, biography, satire)
buy: amazon, mobipocket, ...
Persuasion - Jane Austen (classic romance)
free: girlebooks.com, gutenberg.org, mobileread, ...
Outlander (series) - Diana Gabaldon (historical fiction, romance)
buy: mobipocket, amazon, diesel-ebooks, ...
The Three Musketeers - Alexandre Dumas (historical fiction)
free: gutenberg, manybooks, planetebooks, ...
The Talisman - Stephen King and Peter Straub (fantasy/horror)
buy: diesel-ebooks, mobipocket, ...