Today (March 23) I have released a new program called CHMSite. This console-based Windows program allows you to convert CHM files to HTML webpages.
Most of the effort that this program required went into getting it to read the old HHC and HHK table-of-contents and index formats. The code I made to do this is packaged in a seperate DLL file called HHRead which could also be used for other CHM related programs.
The hard task of decompiling the CHMs into their component files was handled by the awesome program istorage as well as another program called chmdeco. A huge thank-you is in order!