I'm just wondering if it's bad to put in Open DNS ips in my win 2008 dns server's forwarders as well as the DNS ips from my ISP? Is it bad to have lots of DNS forwarders?
Should i just use one set?
It's not a bad idea I guess but consider this. If you are using OpenDNS to filter content what will happen when a request for objectionable content is forwarded to non-OpenDNS servers?? The request will succeed.
I think OpenDNS is a flexible and robust DNS solution and you should feel confident enough to use OpenDNS as your only forwarder.
You should have at least two dns servers in your forwarder list though, to ensure you still get DNS resolution if there is a problem with one of the servers.