• A good starting point for information on quasicrystals is 

Quasicrystal Research at Iowa State University and Ames Laboratory

• Another site with lots of links is Weber's site:

http://www.nirim.go.jp/~weber/qc.html

• Ron Lifschitz's page at Caltech.

• Uwe Grimm at the Open University has a site with general material on aperiodic order.