yeah SPAM is a no no at all time!
Well directory submission would be good in some cases. It all depends on the quality of the directories you are submitting to, for example DMOZ is a MUST submit directory.
I would avoid link farms because as the word out there that they might get you banned!
The best links you get are the links that you find and establish manually! Search the net for similar topics as your site and request a link from them (or a link exchange)



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