I'm looking for more types of site, like proxys, that are easy to advertise, and bring in rather good adsense income. Thanks.
You can pretty much take ANY niche and make good money with it. If you're looking for a quick buck, it's most likely not going to happen. To get GOOD results--results where you might actually go "damn, this can pay for my car lease payment every month!"--choose something YOU enjoy talking about and start a blog (information resource site). The new content daily (or 3-4 times a week) will be loved by search engines and you will get decent traffic if you SEO. I actually suggest taking on 2-3 sites in the beginning. You can start a proxy, but start a real content site just in case.
I am highly considering a sports blog. I would Make a couple of new posts a day. Do these make solid income? How much would it cost to get a sports blog SEO'd? Thanks to everyone for your replies!
Ok, great. What would be a good niche though? Something in high demand, for people to learn about. I know I should pick something i "love" to blog about, but I can blog about almost anything.