I got frustrated with occasional unavailability of my local practice wall, so I decided to check out the city park listings and see what facilities they have. The result is this map on Virtual Earth that pinpoints all the walls & handball courts I could find in the San Jose area. If you use the bird's eye view you can see the courts quite clearly. I'm sure there are more out there. If I missed any, let me know and I'll add them to the list.