Correct, although the Moonlight 2.5 API supports some Silverlight 3 features (those needed for streaming the World Cup, in particular).

Moonlight 3 will ship in 3Q this year; Preview 1 released in February of this year. Microsoft has entered a patent covenant for Silverlight 3 & 4 with the Mono foundation, and as with earlier versions will provide engineering assistance. IOW, Moonlight 4 will happen. So choosing to develop on Silverlight 4 for cross-platform applications is a viable option.

I don't have a dog in this particular hunt, as all my applications end up running on Windows. And since we (my day job) are a Gold Certified Partner, we have all the nice toys to play with (I am itching to get TFS 2010 installed -- with the hierarchical tasks, burndown graphs, etc., it's finally doing what it should have been doing since first release with VS 2005). But someday we'll run into a customer who is big enough to forcefully insist that we run on Red Hat Enterprise or Novell Suse Enterprise, so there's some comfort in knowing the option is available.

Hank

>Last I checked (Spring this year), Silverlight 3 and 4 were not supported on Moonlight.
>
>>Hi Mel,
>>
>>For WinForms, there are various toolkits what will run with Mono: http://www.mono-project.com/Gui_Toolkits
>>
>>Silverlight apps will run on Moonlight: http://www.go-mono.com/moonlight/
>>
>>Silverlight/Moonlight will, I think, give you the most bang-for-the-buck. It can do browserless apps that look just like any other spiffy application.
>>
>>Hank
>>