Most of my earnings have come from 1 site and 1 income stream (AdSense). I did make about $400 from a CPA offer on this site, but that offer died and I've never found a replacement that matches my traffic. I've tried a few other monetization methods but nothing has worked as well as adsense.
My main concern though is that I have not been able to figure out what I did with that site that worked traffic-wise, so I haven't been able to scale or duplicate it. It seems like I just happened to create some content back in the early part of 2011 that google liked and since then nothing else has clicked.
I need some ideas on where to put my time and energy going forward.