We just released 1.2 of our codeplex rules, adding the following rules:

ExtractText2
QueryStringExtractionRule
ValidateCookie
ValidateMultipleCookies
ValidateResponseBody
CRM4Correlation web test plugin

These rules use HtmlAgiltyPack (you must download this assembly separately from codeplex.com/HtmlAgilityPack to use the rules):

ValidateXPathValue
ValidateMultipleXPathValues
ValidateTagValue

Thanks to Taavi Koosaar and Gaurav Bhandari for their contributions!

Ed.