Thanks Dom. From Rand’s blog:
Rand blogged that Bowling was only possible if the up-to-no-gooder’s made it look like the targeted site “participated” in the program by creating the illusion of reciprocal linking. Rand also said the only sites vulnerable were newbie sites, freshly 301’d sites, sites that changed ownership or ones that have never had strong rankings. Sites that have already established themselves need not worry about being taken out. You’re safe.