What types of tutorials are you looking for? The conceptual ideas that go into designing a building or do you want to know about the modeling and 3d aspects of the exterior?
If you are wanting to learn about the 3D side of architecture modeling then this site has a lot of good information:
If you are looking for some good books then check these out. They are the best you can find.
For general 3d modeling for architecture, characters, movies, commercials, etc… check out the CGSociety
These are some of the best video tutorials you can buy.