Ron Jacobs just blogged about how .NET developers can provide feature feedback and vote on WCF/WF features.
http://blogs.msdn.com/b/rjacobs/archive/2011/04/14/how-you-can-make-wf-wcf-better.aspx
Many Microsoft product teams are doing this nowadays. It still surprises me how many .NET developers don’t realize these feature voting sites exist. In addition to WF/WCF, I am aware of these:
http://wpdev.uservoice.com/forums/110705-app-platform
https://windowsphone7community.uservoice.com/forums/84435-feature-feedback
http://data.uservoice.com/forums/72027-wcf-data-services-feature-suggestions
http://data.uservoice.com/forums/72025-ado-net-entity-framework-ef-feature-suggestions
http://dotnet.uservoice.com/forums/40583-wpf-feature-suggestions
http://dotnet.uservoice.com/forums/4325-silverlight-feature-suggestions
http://dotnet.uservoice.com/forums/87171-visual-basic-content-requests
http://dotnet.uservoice.com/forums/57026-wcf-ria-services
http://www.mygreatwindowsazureidea.com/pages/34192-windows-azure-feature-voting
http://www.mygreatwindowsazureidea.com/forums/35889-microsoft-codename-dallas-feature-voting
http://www.mygreatwindowsazureidea.com/forums/44459-sql-azure-data-sync-feature-voting
http://www.mygreatwindowsazureidea.com/forums/34685-sql-azure-feature-voting
http://www.mygreatwindowsazureidea.com/forums/100417-sql-azure-reporting-feature-voting
http://www.mygreatwindowsazureidea.com/forums/40626-windows-azure-appfabric-feature-voting
http://www.mygreatwindowsazureidea.com/forums/103009-windows-azure-code-samples-voting
http://www.mygreatwindowsazureidea.com/forums/103403-windows-azure-content-voting
http://aspnet.uservoice.com/forums/41199-general
http://aspnet.uservoice.com/forums/41201-asp-net-mvc
http://aspnet.uservoice.com/forums/41202-asp-net-webforms
http://aspnet.uservoice.com/forums/50615-orchard
http://aspnet.uservoice.com/forums/100405-performance
http://aspnet.uservoice.com/forums/41233-visual-studio-performance-feedback
Let me know in the comments if I’ve missed any. I’ll add them.