I feel a bit ashamed that I didn’t realize this earlier. In the same way you can share songs or app links, you can now share your Ping Profile. Just right click on your name, or “View Profile” link, and select “Copy Link”. Then, paste it on Facebook or Twitter to help your friends find you.
Without Facebook support, Apple’s going to have a hard time getting Ping started. But being able to paste your profile link into other social networking sites is a huge help.