I got the Audiveris sheet music OCR app installed the other night, and it does work--however, it requires 300 DPI sheet music scans in order to operate, and none of the ragtime sheet music I found online was anything close to that high-resolution. (I tested it using high-res example scans installed with the app.) As with most Java apps, it is agonizingly slow: It took seven seconds to pop up a simple Save As dialog, on a 3.2 GHz SX270 with 1 GB RAM. I also had trouble getting audio output via its MIDI support; however, after saving the generated MIDI to a disk file, the MIDI file played normally through several different player apps.
ZDNet posted one of the better ebook reader evaluations I've seen lately, and while it appears to be Kindle vs. iPad, it's really e-ink vs. backlit LCD. I'm currently with LCD. I don't read outside for many reasons, including a lack of comfortable chairs out there, and a feeling that if I'm outside I should be walking or climbing or digging or something.