If you're around Olympia, WA, you should stop by and attend to Chris Bilson's presentation on MonoRail. Quoting ssdotnet web site:
"Developing web based applications is full of challenges and pitfalls: session state, view state, post backs, control trees, and page lifecycles. How many times have you heard the dreaded, “I clicked refresh and it debited my account twice!?!?” A number of people have come up with clever ways to simplify web apps. Some don’t actually make it more complicated. Let’s talk about one framework, Monorail, some of the things it brings to the table, including it’s ultra-simple data-mapping API, ActiveRecord, and finish off with a discussion about database unit testing."
Being a little nitpick here I do need to state that MonoRail and ActiveRecord are two completely separated projects. MonoRail offers some level of integration with ActiveRecord and the Windsor container. But, yada yada yada, that's irrelevant. It's cool that people are talking about it. :-)