I had a nice chat with a collegue about the ORM tools that we've used. I once did a project using NHibernate and I've been very satisfied with the experience. His tool of choice is base4.
It's the first time that I've heard of base4, so I quickly visited its site. I think it looks good. It even has a 15min-video showing off how fast you can get to a database (Northwind) using it. Not bad.
I think I got a new toy.