Till Now I used to use XAMLPad for testing XAML snippets. I installed KAXAML today(http://www.kaxaml.com). Installation was smooth. I started loving it after seeing the welcome screen –
The tool is a really wonderful tool and the more you use it, you would love it. It has all the richness, styling and look that WPF is meant for. if you have not tried it, give it a shot.