Here's a screenshot of Reflector running on Mono 1.1.17. The tree view seems to work fine. Unfortunately the Dissasembler view is throwing an exception. Still very impressive. I expect it will be working a lot better in the next release. Well done Mono team! :)
Here's the exception the Dissasembler view throws.
Value '-16' must be greater than or equal to 0. System.Exception at System.Windows.Forms.ScrollBar.set_LargeChange (Int32 value) [0x00000] at (wrapper remoting-invoke-with-check) System.Windows.Forms.ScrollBar:set_LargeChange (int) at System.Windows.Forms.TextBoxBase.CalculateScrollBars () [0x00000]