wheel - 12:11 pm on Jun 21, 2011 (gmt 0)
None of the link building methods provide any signals of quality. All of them seem like they are methods that are easily duplicated by others, and therefore likely will be duplicated (meaning your backlinks look like them). I'd expect these are things that Google is/will be looking for. I'd suggest that you have multiple discrete sites so that if and when one site gets turfed by Google you're not left with nothing.