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The Digital Archives of the Beethoven-Haus contain over 5000 online facsimiles of music manuscripts, sketches, first editions, letters, and photographs, accompanied by audio files, bibliographies, and historical background.
The Beethoven-Haus in Bonn (Beethoven's home town) has an excellent page that includes Beethoven's original manuscript for the Pastorale Symphony, some of his sketches for it, and a copyist's manuscript (much easier to read!) with Beethoven's corrections. It also has Beethoven's letters pertaining to the symphony, and even works of art inspired by Beethoven and the Pastorale Symphony.