As a 500 Startup mentor I would suggest the following
1) Blog about distribution, design and data. Those are the things that 500 values most and usually the fastest way to get on their radar.
2) Interact with @davemcclure (and all other partners) on Twitter
3) Attend geeks on a plane or other events they host.

It's all about relationships and perception, so create opportunities to increase the probability of showing them that you have skills that are relevant to the companies they invest in.

Hope that helps.