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For format string information - that is, all the cool extra stuff you can do over System.String.Format - see http://www.codeproject.com/KB/string/Custom_Formatting.aspx
Documentation coming soon ... hopefully. Until then, import StringFormatEx.Extensions namespace and: myString.FormatEx(arg1, arg2 ...)
Also, you can check out our project Roadmap to see what tasks we're working on.