Oh there are so many good ones. Robert Lang's "Origami Design Secrets" is sort of a bible. Also, there are 2 publishers worth checking out: Origami house and Origami Shop (http://www.origami-shop.com/m_index.php)
admittedly I haven't looked at them for years, but they still seem to have quite a range of Robert J Lang, John Montroll, etc.
An aside - there are other connections between computing and origami; 20 years ago Bern & Hayes showed that assigning mountain or valley folds to a crease pattern in order to make it fold flat was NP-complete http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.28.1... (and is also in the "I wish I'd thought of that" category. It was a question from me on Usenet that piqued their interest in origami, so I got an acknowledgement in the paper - but I wouldn't have come up with that idea in a million years)
admittedly I haven't looked at them for years, but they still seem to have quite a range of Robert J Lang, John Montroll, etc.
An aside - there are other connections between computing and origami; 20 years ago Bern & Hayes showed that assigning mountain or valley folds to a crease pattern in order to make it fold flat was NP-complete http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.28.1... (and is also in the "I wish I'd thought of that" category. It was a question from me on Usenet that piqued their interest in origami, so I got an acknowledgement in the paper - but I wouldn't have come up with that idea in a million years)