Two custom controls are posted now in WIT custom controls codeplex project: http://www.codeplex.com/WitCustomControls . Controls are: Screenshot control for easily getting & attaching screenshots and WebSiteControl where a website can be hosted inside work item form. Users could add some active content by hosting ASP.net forms in that website control. Thanks to Mathias Olausson for his help in getting these checked in and release made. It comes with a setup package.
We know that MultiValueControl is much needed. We are thinking of releasing multivalue control in future powertools instead for broader reach and we are working on that control.