>I've heard good things about Balsamic Mockups. Not specific to Silverlight however, and doesn't produce code, but is pretty good for UI mockups which is really the key feature IMHO.
>

I took a look at that yesterday. It does look pretty good, and the pricing is MUCH better!

If anyone is interested, here are links to a bunch of prototyping apps that seem pretty interesting..

http://www.balsamiq.com/products/mockups

https://gomockingbird.com/ (monthly subscription)

http://www.foreui.com/

http://wireframesketcher.com/

http://www.mockupscreens.com/

http://www.mockflow.com/ (monthly subscription)



>+++ Rick ---
>
>>We're looking for a decent prototyping tool for upcoming Silverlight development.
>>
>>It appears that the really cool tool is Expression Sketchflow. Looking at a couple of videos on it, we'd jump on it in a second if it could be had at a reaonable price.
>>
>>We have MSDN premium subscriptions, and I have my Certified Partner subscription - naturally none include Expression 4 Ultimate which is the only Expression version that includes Sketchflow. It appears our only choices for getting Sketchflow are upgrading our MSDN subscriptions to Ultimate (about $8000 UPGRADE price each per year), or buying seperate Expression Ultimate versions for $600 each or upgrading (possibly - not sure that works) for $350 each.
>>
>>Since we're not going to bend over for Microsoft, are there good alternatives for prototyping a silverlight site?