I am attempting to improve the SEO on 6 holiday websites that offer villas, apartments to various european holiday destinations. I am link building and blog posting and this seems to be having a slow but positive effect. I am also contributing to yahoo answers and this seems to be helping as well. Forum posting has also been mentioned as good way of getting in sneaky links. My limited experience of this has seen me being thrown off forums for trying to promote my sites even if done in a good way. Does anybody have any hints and tips?