http://conceptdev.blogspot.com/2010/08/uiglassbutton-generator-in-monotouch.html
"Gradient background on a UIButton / emulating UIGlassButton" http://www.shrinkrays.net/code-snippets/csharp/monotouch-tips-and-snippets.aspx linked to Martin Bowling's sample using UIGlassButton (ZIP) http://bit.ly/MTGlassButton
http://www.tuaw.com/2010/02/19/iphone-devsugar-create-shiny-buttons-easily/ (Erica Sudan) mentions Objective-C version from @schwa (Jonathan Wight) http://pastie.org/830884