ESB in a .NET environment

Regarding for information about ESB over .NET environment, I found this two alternatives (see Jesus Rodriguez's WebLog at http://weblogs.asp.net/gsusx/archive/2007/10/09/some-thoughts-on-esb-vs-rest-dynamic-languages.aspx):

Neuron ESB:
http://www.neudesic.com/Main.aspx?SS=7&PE=75

ESB Guidance Toolkit:
http://www.codeplex.com/esb

Now I am studying both alternatives...soon I will tell you my opinion.