Ow, I feel your pain, having had surgery on each of my shoulders in the past.
Anyway, re: reading suggestions--What about reading up on lace knitting? I had a few interesting books out of the library a month or so ago on this. I can't remember the titles, but they had lots of history and stuff about Shetland wool and various fibers, as well as bios on shawl knitters from Peru, etc. There were patterns in there for historically famous lace patterns, etc. If you can't knit right now, it will make for interesting reading.