In case you feel like delving deep into Gibbon:
Here is a Selected Bibliography: Edward Gibbon (1737-1794). Also, for those with JSTOR access: If you perform an extended search: "Gibbon" (Title & Articles, Classical Studies and History), you will find one entire page with a variety of articles.
Online biographies and such:
Wikipedia, with the usual reservations
1911 Britannica
Edward Gibbon, Historian of the Roman Empire by Eugene Y. C. Ho
Part I The Man and His Book Part II A Closer Look at the Decline and Fall
Finally, I found the facsimile print edition of
The Autobiographies of Edward Gibbon : Printed verbatim from hitherto unpublished MSS., with an introduction by the Earl of Sheffield
John Baker-Holroyd, 1st Earl of Sheffield, was Gibbon's friend and literary executor.
There is also a modern edited and abridged version in Penguin Classics: Memoirs of My Life
