This part of ElvisNews brings:
Formerly known as the SongBase: a complete overview of all songs recorded by Elvis Presley, including lyrics, all songwriters, date of the recording of the first released version, and the musicians playing on that first release.
A far from complete list of import releases, not maintained anymore, but all essentials are there, so we'll leave it for reference.
Day by day
The original internet version of Day By Day, inspired and based on the great work by Peter Guralnick and Ernst Jorgensen.