As said above, masking your footprints is the single most important element in interlinking strategies. The footprint includes: host location, IP, site code, content, registrar, nameservers, DNS record modification dates, domain transfer history, whois information and more.
SEO hosting can help with a few of those, but you still need to handle the rest of the factors if you want to succeed.
Another free tip is for interlinking networks, pay close attention to link velocity/acceleration. You want things to seem as natural as possible, so the following throws up a flag to google:
- Many new links all appearing at once
- Links almost all using the same keyword anchor text
- No links dropping
- All links coming to the same/main page of the domain
What you want to do, is:
- Links added gradually
- Links dropped gradually (of course, always keep a positive link acceleration pace)
- Mix up / rotate anchor texts, throwing in some non-relevant or domain name (as would naturally happen)
- Mix linking to main pages and deep links
Enjoy
