Where can I find a listing of the JVM versions that are in the major & latest browser versions?
John Zukowski What JDK version does Internet Explorer support? points out a specific resource from Microsoft about browser versions. As far as a more general list, including browsers other than IE, Volano has a nice list for Windows and Macintosh browsers. It is meant more of a compatibility list for a product of theirs, but includes the information you are after.
Not aware of a similar list of Unix/Linux browsers. Please submit feedback if you know of any other lists.