The industrious people over at Mindscape have released version 1.1 of their LightSpeed domain modeling/ORM framework. I used LightSpeed while it was in beta with my first Silverlight application and it has definitely matured a lot since then.
There are a bunch of new features in the 1.1 release including my pet feature request: default ordering of entities and child entity collections [:)] Now if you have a Purchase entity, the PurchaseLine collection on it can be explicitly ordered by line number for you when it loads. Cool!
You can find out more about LightSpeed here.