Here are some links to origami instruction websites:

http://www.origami-instructions.com: a great website with several levels of folding for all ages.

http://www.origami-fun.com: a website with printable PDF diagrams and several other features.

http://www.en.origami-club.com: a large database with very many models; focuses more on the fun look and is easier to fold.

http://hektor.umcs.lublin.pl/~mikosmul/origami/spiky.html: If you like folding modular origami, go here! This website is a veritable stock of modular models, ranging from simple to terrifyingly hard. Also try their main origami page at http://hektor.umcs.lublin.pl/~mikosmul/origami/index.html

You can buy origami paper and books here:

http://www.origami-instructions.com/origami-gift-store.html

HAPPY FOLDING!