I don't know if anyone still reads this list, but just in case, I'm currently working on a rotating network of anonymous proxies and am looking for some feedback. The idea is that each request goes thru a different proxy, and the available proxies change on a regular basis, so that your visible IP address keeps changing. This way, it's much harder for crawlers/spiders to get IP banned or rate limited. I'm using this setup myself right now, but I'd like to know if anyone else is interested this service. If so, let me know, and I'd also appreciate it if you could fill out this short customer development survey:
http://streamhacker.wufoo.com/forms/proxymesh-a-rotating-network-of-anonymous-proxies/