- Social Bookmarking
- Web 2.0 Properties ect.
But I've seen a neglect in mentioning buying up Ad Space.
I've found out that I can get some very targetted and HIGH Quality traffic buy buying space on sites that are already established this is excellent for my websites where I operate lists because this means I can get traffic from a source that relates to my niche then build up my list using that traffic.
I appericate people may prefer attempting to get High SERP rankings and may see this as a "short cut" but I just think buying ad space for a new site helps the site until it gets to reasonable positions in SERPs.