SWT is a commonly used Java GUI framework, brought to the masses by the Eclipse project. Every once in a while there is customer that wants to migrate from a SWT-based application to C# using the JLCA, but so far this conversion required a significant effort in order to build the necessary infrastructure.
Well, now there's hope. I just noticed that the good guys at ICSharpCode have a version of SWT for .NET, called the Sharp Widget Toolkit (SharpWT or #WT). With this library and the JLCA Companion, we should be able to automate the conversion of a significant portion of SWT-based application, and get them up and running on .NET very quickly. Based on their previous work, the SharpWT library should be very high quality - they also developed the #ziplib library, to which we've often converted the java.util.zip.* classes, and other projects you can check out on their website.
So, there you have it - there is hope for SWT to .NET migrations. ;o)