Html Help 2.0 is a non-issue unless you plan on building developer documentation for integration in Visual Studio.
At the moment HTML Help 1.0 continues to be the most widely used standard and HTML 2.0 is just a specialty case that will never go anywhere beyond where it is now. There is a new help system in Vista, although there hasn't been much information on what is actually involved with this (or let me rephrase that I haven't looked real closely into that).
IAC, if you build end user documentation at the moment everything (FoxPro and .NET, Delphi etc.) consumes HTML Help 1.0 (CHM).
Help Builder lets you build both 1.0 and 2.0 help.
+++ Rick ---
>I am confused as to what to choose when using West Wind HTML Help builder. What are the advantages of using HTML Help 2.0 vs 1.0? I believe in the past I have used 1.0, although this question never came up when I was building the HTML help last time (long time ago). Now I am looking for upgrading and building help again and came up against this choice.
>
>Any explanation would be greatly appreciated.