If you have a relevant website that you'd like to have added to the list, please contact me. Enjoy!
Find a Grave: Helen Kane This page has a short blurb about Helen's life, as well as detailed information about how to find her grave in Long Island National Cemetery. (If you plan to visit Helen's grave, be sure to write down the directions carefully. I decided to rely on the cemetery's database upon arrival, which was a mistake - several women named Helen Kane are buried there, and the grounds are enormous.)
Jazz Age 1920s David Garrick has a wonderful collection of biographies, photographs, and music files from early and forgotten jazz singers such as Cliff Edwards, Jane Green, and the Brox Sisters.
Ruth Etting: America's Sweetheart of Song A tribute to Ruth Etting, one of the biggest stars of the 1920s and 30s. The site is maintained by the granddaughter of one of Ruth's cousins.
Archeophone Records This record label releases rare music from the artists of the late 19th and early 20th centuries. The Archeophone albums that I own are wonderful, and the liner notes are among the most extensive I have ever seen.
Helen Kane on Wikipedia An interesting article on Helen's life and career, with a few pertinent links.