Here's my commuter/joy riding bike - a Santana Moda. I don't have much info about these bikes but I believe Santana made mountain bikes for a short time in the 80's. Its made from Columbus Max OR steel tubing. The tubing is oversized with oriented elliptical cross-sections. In some places its as pretty thin (0.5-0.6 mm) so its banged up from spills and hits from riding in NYC and New Orleans but still going strong. I just moved from NYC to Boston so it hasn't been on the road in a couple months. I'm cleaning it up this week and getting it back on the road for commuting to work. My winter project may be to strip it down for powdercoating.
More at...
http://www.flickr.com/photos/8598861...57602209363450