Now that explains the "ag"...

WPF/e is now called Silverlight. Quite a nice name, perhaps a little cold, doesn't exactly roll of the tongue, but it's better than Microsoft's usual overly descriptive attempts.

More importantly, it joins the dots on why the scripts and mime type where referencing "ag" (agHost, ag-plugin, etc). Isn't it nice when loose ends get tidied up like this?