Ever heard of NicheReaper? It’s a subscription-based service that has a database of just under 2,000,000 fully researched keywords (about 20,000 new keywords are added each day).

The keywords are researched for their profitability (so you get a ballpark figure of how much can be made with Adsense per month) and how many opportunities there are to rank the keyword in one of the top 5 positions on Google using competition analysis.

Keywords are grouped by niche, so you …