I hate to pitch on my very first post but when I came across Cyburbia in my internet travels I knew I was at the right place.
We operate a non-profit organization called Skaters for Public Skateparks. www.skatersforpublicskateparks.org
At SPS you can find lots of great information about skatepark planning, design, and management. There are tips on siting, metrics for calculating how many skaters your new skatepark will need to provide service for (and thereby how large the facility should be), progressive concepts on mapping out whole community-wide skatepark systems, plus lots more.
Like Cyburbia, the forums are where most of the action is taking place. There you can get articulate feedback from experienced skateboarders. There are discussions about what types of designs service what types of user groups...and with that you can tailor your new skatepark to attract the right balance of users...not just a bunch of rowdy kids (without a skateboard in sight).
How can skateparks prevent graffiti? Is concrete better than prefabricated structures? Will your insurance go up? What adjacent uses go well with skateboarding? What kind of land do I need and how big should it be? We've spent years hashing this stuff out!
The fine folks at SPS are regionally diverse. There's probably a contributor somewhere near you if you prefer face time. If you just want a few good webpages, check out the Skatepark Process and the Forums. If you prefer print, that's cool...we've got a book called the Public Skatepark Development Guide. You can find out more about that at www.skateparkguide.org.
It's all legitimate...the people behind SPS are 100% volunteers, professionals by day, skaters by late afternoon. And, the best part, it's all free...the information, the book (you pay shipping), our time. We are in it to see more communities make good decisions when it comes to skateboarding terrain.