> Silverlight apps can look just as polished as desktop apps. This is not true with DHTML/Javascript.
You should really try MobileMe, or 280slides.
There are a number of other web apps written in Sproutcore and Cappuccino that feel exactly like desktop apps, without an ounce of flash or silverlight.
No, you cannot. You can use .Net and language implementations that run on top of .Net. This includes IronRuby (dead?), IronPython, and JScript.
> Silverlight apps can look just as polished as desktop apps. This is not true with DHTML/Javascript.
This is not a feature that consumers care about.