This is kinda dirty but I thought of it while I was pinging some sites at ping ler a while back. If you look under where you put the captcha you will see what other people are pinging. I would advise against stealing exact match keywords, but it can give you an idea of what niche to jump into. You might find some hot low competition keywords in there. This also could be a warning to all using pingl er. People can see what your doing. Ive used it to find several profitable and low competition keywords. Might want to give it a shot!