I do like WPF and Silverlight. And tools build on top of it like Prism and Caliburn make it even better. If you don't know what Caliburn is, it can be best described as a lightweight framework to help you implement some important UI patterns on top of WPF and Silverlight. It makes your life a lot easier and your boss happy because you'll be a lot more productive.
So its good to see that Caliburn finally made it to Release Candidate 3. Let's hope we get a first release soon.