Warning: This is simple and newbieish and not at all BH. It will be useless to you unless you're new! I see a lot of people new to affiliate marketing struggling over choosing a niche. There are many ways you can find a niche - Google trends, eBay and Amazon hot products sections, etc. - this is just one more. Grab one of those packs of PLR from the Members Downloads section, or anywhere else. A lot of people give them away for free just for signing up to their list. Have a look through the articles and voila! Loads of new niches for you! I just opened up one of the many packs I've downloaded (and never used...) and there are articles on Feng Shui, Fruit Trees, Garage Remodeling, Martial Arts, Microbrews, Vacations in Mexico... Some of these will lend themselves to AM, some to Adsense. And the best thing is, you already have articles to rewrite!