Along with the RC of Silverlight 1.0, Silverlight 1.1 has been slightly updated. This update reflects changes made at the 1.0 level.
For Bubble Factory, the only breaking change was the use of Visibility.Hidden which has to be Visibility.Collapsed from now on.
Apart from that, the update went pretty smoothly for me.
Also, many of you have been asking me when will the sources of Bubble Factory be published.
I am actually working on it right now and should be able to post them by next week certainly on codeplex.