OP I haven't been doing this long at all but what I have fathered so far is to tier your links - create separate domains, if they've got equity even better then create/emulate content use a blackhat software like what gsa have or rankerx, post on sites which are crawled often, then make a higher tier but with these, aim for quality links on 2.0s. Theres a guy on blackhat section here who always posts good lists of links of 2.0s for something called parasite pages. Not tried it yet but it's worth a look. Drip links from low tier to mid tier. Hardest part is to make sure that your lonking is not totally transparent