SEO is great for long term, try and find those niche markets..every day I find more..
Social Media you have to love! Facebook and twitter do great!
Also, though I never see it mentioned, online classifieds work, but need a paradigm shift to make them work.
Also I encourage you to look at torrents. Lots of nice money to be made and a lot of affilaite programs even have e-books etc ready for you to go!
And for me personally, I love “video seo”, is amazing what you can do with the video sites out there…cheap and free to start if you on a budget, but 100% the best ROI for me.