Subsonic 2.1 was released with a number of new features to help with those database-driven ASP.NET websites.
I converted a few of the screencasts to the iPhone ( m4v ) Format using Camtasia. In the future I will get better at this.
LLBLGen Pro has optional LINQ To SQL Templates to generate LINQ To SQL Classes.
As someone who has written a simple O/R Mapper - Hayden.ActiveRecord - I can tell you that writing a simple, opinionated O/R Mapper is easy and fun! But...
You just don't see such great documentation and guidance from other open-source projects :)
Check out Developer Express' AgDataGrid Suite currently in beta 1.
The new LightSpeed 2.0 O/R Mapper adds a sweet Visual Designer with Database Round-Tripping and LINQ Support.
You can download the Composite Application Guidance for WPF ( PRISM ) RC1, which isn't expected to change much before its release in a couple of weeks.
Let us not forget about another open-source, rockstar dependency injection tool, Autofac, now with Castle DynamicProxy2 Integration.
A few quick samples of using the Ninject InlineModule, Factory Methods, and Providers.