ClickOnce is a Microsoft deployment mechanism for WinForms and WPF applications that works great in Internet Explorer. Thanks to an extension, you can also get ClickOnce applications to work from Firefox too. FFClickOnce was created by James Dobson. Check out the homepage where James describes what it does and how it works very nicely.
In this silly season where many people are racing to download and run WPF applications, this extension will make it easier.
[via Scott Stanfield – who does a great job evangelizing Firefox]