Natashka - 6:24 am on Jun 3, 2005 (gmt 0)

- if someone else shares IP with you, and makes extensive spamming actions of any sort, leading IP to be banned, added to spam lists or something of this sort

that may be true for smaller hosts and resellers, but I doubt they will apply this tactic to a big host, I am sure Google has IPs of big hosting companies (at least in US!) on their list.

I'm hosted on a huge host, (shared IP), and there are 9909 other sites on the same IP, some of them are definately blackhats, some even may have been banned, but it never hurted my ranking, and I think it's kinda stupid to ban 9908 sites because of 1!