We had a pretty good curriculum at school, but we never had summer reading lists. The class read the books and plays together during term time and that was it. I'm not sure how much it's changed since then, but I know they still have to read Lord of the Flies which I loathed, so I guess probably not much has changed!
We read Shakespeare's A Merchant of Venice and compared it with more modern plays such as A Taste of Honey (I can't remember who wrote that). Novels included a couple of Steinbeck, Cider with Rosie and Brave New World, but not much of it actually inspired me to my own reading tastes - most of that I've developed myself as I always read outside of the curriculum anyway.
The one book that I've kept and re-read is a play called Arms and the Man by George Bernard Shaw, and I loved it so much, it did encourage me to see any of his plays when they were performed in my area.