I am helping out with the Orlando .NET Code Camp website and they needed to add an image button, which is something that is not supported out of the box by the current release of MVC. So after looking around I found BuildUrlFromExpression. Unfortunately it had been moved in the latest release and I tracked it down to the Futures project in CodePlex. Instead of being part of Html, it’s under LinkBuilder now, this is how you use it:
<a href="<%= LinkBuilder.BuildUrlFromExpression(null, Html.RouteCollection, x => x.Action() ) %>">
<img src="images/img.gif" alt="Some image" style="border-style: none"/>a>
Which when clicked, would call into your controller and get routed correctly.
After downloading the Futures assemblies, you need to reference the Microsoft.Web.Mvc assembly and add this to your config file, under
<add namespace="Microsoft.Web.Mvc" />