I've read The Eyre Affair a while back, and was absolutely hooked.
It's a very unusual book, aimed at people that love books and literature.
Fforde is very creative and original, his writing rather tongue-in-cheek. He managed to come up with a book that does not fit any single genre. I can't really compare him to any other author (though his originality somewhat reminds me of Douglas Adams, the style and subject matter are very different, making this an apples-to-oranges comparison
Also, unusually enough, the second book in the series is even BETTER than the first. The rest (there are 5 total with the 6th supposedly in the works) are pretty good as well, though the novelty wears off a bit and the effect isn't as strong as in the beginning.