That is such a good books, the ending is a little weird though. I also loved Tortilla Flats, also by John Steinbeck. In the non-fiction genre, Roadside Picnic is also really good.
How you think about or are influenced by books are also dependent on your current mode and situation. I also enjoying and have great memories from reading "The Soul of a new Machine", the stress that I felt from that book reflected my own work situation of at the time, so it some how stuck with me more that I believe it would have done at another point in time.
On the weirder side of things: As I grown older I felt like I lost the feeling of magic during Christmas time. So every year I read a stupid Christmas themed romance novel. The previous two have been "Snowed In for Christmas" and "The Christmas Bookshop". I recommend both.