Hi,
I have been using Schwalbe tires for several years of hard urban commuting through copious glass and potholes. They have been crazily more resistant to puncture than my previous tires. I used the Marathon Plus and was very happy with them. Their only defect was that they were very difficult to mount. I can usually change a tire in 3 or 4 minutes, but the Marathon Plus takes me about 15 to 20 minutes of hard struggle. Once you mount them, though, the puncture resistance is great.
Peter White's page has a good description of the various Schwalbe tires:
http://www.peterwhitecycles.com/schwalbe.asp
I bought the tires at my local bike shop, but if you can't find them there, Peter White can sell them by mail.