My vbscript to which the ajax goes dumps both the Request.Form collection although I did not actually expect the Request collection to be there.
For Each Token In Request.Form
Response.Write("Form: "&Token&" = "&Request(Token)&"<br />")
I did expect it to be in Request.QuerySting
For Each Token In Request.QueryString
Response.Write("QueryString: "&Token&" = "&Request.QueryString(Token)&"<br />")
My analysis suggests that the jQuery/Ajax side of the transfer looks OK but that, for some reason I can't figure out, the parameter values don't show up in either the Request.Form or Request.QuerySting collections in vbscript.