Robert_Charlton - 10:42 pm on May 21, 2004 (gmt 0)

Also If you have 2 Web Sites and targeting same keywords on the same server, Only one of them ranks even if other one has higher PR.

This is exactly one of the things I was thinking about, even if you're not targeting the same words, but the sites are related in subject matter and tend to run in the same neighborhoods.

caveman - I'm eager to see what you post on the IP number issue. It's a topic that might also need its own thread.

Incidentally, when your server is down, Google will try again before dropping you. I don't know what kind of time window you have, but GoogleGuy has said this explicitly on the forums here, and Matt Cutts has said it at SES.