WPF vs WPF XBAP vs Silverlight

Many have answered this question and many have asked me the same... So after research from various sites including http://silverlight.net and http://blogs.msdn.com/ this is what I conclude:

 

	WPF	WPF XBAP	Silverlight	Ajax.Net
Client - OS	Windows XP SP2 & Vista	Windows XP SP2 & Vista	Windows XP SP2, Vista, Mac, Linux	Any OS
Client – .NET FX	.NET 3.0	.NET 3.0	Silverlight Plugin	Not required
Client - Browser	NA	Internet Explorer 6+	FireFox, Mac Safari, Internet Explorer	Any Web Browser
Deployment	Downloadable Installer or ClickOnce	Runs in Internet Explorer secure sandbox	One-time install of Silverlight plug-in	Web Page
When to use	Programs that need access to Windows desktop files.	Intranet applications for Windows-oriented companies.	Rich Internet Applications for public-facing web sites	General-purpose public-facing web sites
Disadvantages	Typically works on MS-OS only	Mostly internal sites for companies that use MS-OS.	Works on any browser but has limited functionalities compared to WPF, WPF XBAP	Lacks Richness in UI

Guess this will be helpful in analysing situations where to use what!