Since I have previously posted some Winterreise links, now is the time to do the same with Schubert's first song cycle, Die schöne Müllerin, although the online pickings are nowhere near as plentiful.
The best website on the subject is James Liu's Notes on Die schöne Müllerin, with complete texts and translations, info on composer and poet, recommended scores, recordings, and readings, all exhaustively hyperlinked. The only links from his site that don't go through are the online documentation at urtext.com, to which ordinary mortals do not have access. The William and Gayle Cook Music Library site of Indiana University has an online version of the Peters Edition.
The Schubert Institute UK has a complete Die schöne Müllerin discography, including pirated recordings, accurate to November 2005.
Also, here is a Schubert chronology by John Bruzas.