Here's one that will give you good results if done correctly ...
Leave backlinks on different IP addresses - as simple as that. This will help you achieve two things:
a) Create diversity to your whole backlink structuring
b) Give you some high quality link juice
Make sure you're looking for .gov or .edu links from countries like:
- Vietnam (vn)
- Russia (ru)
- China (cn)
- Philippines (ph)
The reason for this is that their websites are really easy to post on, be it blogs or forums. Leave useful comments and target sites related to tourism, sports, technology, education, etc.
When looking for different IPs, type the following in the search box (an example) -
That's about it!