Well, it finally happened. The old WotC forums are dead and buried, and among the casualties was the Master of Many Forms Bible, by Harzerkatze. At some point in the past, I had taken his list of good forms and dumped it into a spreadsheet for ease of reading. I never finished the work I had planned to do on it, but it's at least preserved, in a much more legible form. Check it out
here.
The doc currently has two sheets. One gives a list of forms that open up at each level of the class, while the other is more granular to allow filtering. To use this second page, you will need to enable the data filter. Google, in their infinite wisdom, does not allow table filters to be enabled on a sheet by default, so you will need to turn it on yourself.
Discussion thread
here.