Have a read of "The Day of the Triffids", very easy to read, and an excellent read at that. Rather short novel as well.
Expand that to John Wydnham books in general. Very good author. Isaac Asimov is another classic writer who's worth giving a go. He written loads of short stories, which might be a good place to start.
One quick read you can get onto right away is http://www.doomworld.com/10years/doomcomic/comic.php! A man, a demon, and a search for a bigger gun.
I dunno how you'd go reading Peter Hamilton's http://www.bookdepository.co.uk/Mindstar-Rising-Peter-Hamilton/9780330323765, but it is one of his shorter books, and he is a good writer. Hard sci-fi. The http://www.bookdepository.co.uk/Ciaphas-Cain-Sandy-Mitchell/9781844168835 (that collection is thick, but the individual books within it are only a few hundred pages each) are soft sci-fi set in the Warhammer 40k universe, and quite fun. http://www.bookdepository.co.uk/V-for-Vendetta-Alan-Moore/9781845762278 has very dark themes and plenty to think about if you're that way inclined (possible downsides), and I recommend reading it. http://www.schlockmercenary.com/2000-06-12 is a good, fun webcomic, and has the big pro of being free to read. I'd give some fantasy suggestions, but for some reason they're just not coming to me

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I might chuck you some more later.