free directory submission blog submission article posting comment posting in blogs and forum posting - in forum posting take your site as a signature
add a blog to your site add a forum to your site write articles write blog entris on other peoples blogs submit to classified websites and free directories buy high pr links of other websites
Manipulating your site to rank High is also violation of google's TOS any way here are some free & paid. free :-> directories, article directories, forum post & signature, blog post(do follow), 2 way llink exchange ,3 way link exchange, press release submissions. paid :- text-link-ads.com( it's good as you get direct back link) buy banners & review at blogs.
I think everyone has some good advise (minus the link buying of course). You could also try some good old PR.
Well, I'm always going with natural links it will boost ur ranking don't think that gain as much as possible try to gain quality not quantity
Isn't it buying links are against by the TOS of google? and I guess the best way in gaining backlinks is doing 1 one link in related site like directory submission and social bookmarkings. and as what ingridk mentioned above^, blog commenting will also do but see to it that they use do-follow..