I follow a few methods:
1. Link by niche within my own network to build tiers
2. Link to pass PR. I'll have one site PR3 - 5 and use the topmost site to pass to the next tier and so on
3. Link whore my own sites to my WLs
4. I'm old skool and have most of my network on different geo-IPs and c classes spread across 7 different hosting co's - maybe that's overdoing it - dunno
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