Here's some of my tips for you proxies:

[1] Submit to topsites, as many as you can. I know that people who look for proxies go on topsites, and target especially new ones. Most proxy topsites are run on Aardvark PHP, and as a template creator for the guy who runs it, I know it pretty well. Most topsites have a link that is "ssi.php". For example, topsitedomain.com/ssi.php - A lot of the top proxy topsites have this on, so you can see the latest 20 topsites submitted. Then they post it on blogs [Iran/Middle East/Asian blogs] and from there, traffic goes crazy
[2] Do not have a domain with the word 'proxy' in it. When I buy domains, I move away from them. Why? Because that is the number one word that filters block. "Proxies" is usually blocked as well
[3] Ads that blend are better, and before it was banned, images of attractive females next to them But that is no longer allowed. So keep your ads blending in well
[4] Create a network. Sooner or later, your proxy will be blocked. Solution? Start another one. Then that gets blocked, so start another one. Thus, a network starts to form. After a while, you will be very $$$ but be careful about overloads on the server
[5] Bandwidth code - Attached is a code you add (Made by Billy Connite) to your script (PHProxy) to minimise bandwidth and hotlinking. It saves you a lot of $$$ and downtime. Simply copy and paste the mod code into your index.php page, just below the php at the top of the page.
I have another million things to add, but what do you have to share?