I've been testing the linkvana service for a couple of weeks and seen a distinct increase in serps on the target pages and a 40% increase in traffic since starting using it, with a similar increase in earnings.
It's basically a large network of blogs to which you can post small, text based content containing a single keyword backlink. The system seems to be well organised and maintained, though the admin interface has a few odd quirks that are no big deal. This is not a link farm as this is still based around real content you create, simply distributed across multiple blogs on multiple unique IPs. You can promote multiple sites/domains with a single account and distribution rate of the posts is defined by you. Seems to work for me, though I'm giving it a full two month test to see how it runs and will report back if anyone is interested.
Linkvana - One Way Link Building << in the interests of disclosure, that link does contain an affiliate code, just use linkvana.com if you object ;)
Linkvana linkbuilding
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