The biggest one you missed is eCommerce. Selling physical products.

@Alan, indeed! I will add that to the list now. Thank you.

affiliate marketing is hands down the fastest way to make money online (PPC Affiliate Marketing). I have linked to 2 good networks on my site where anyone can make a quick buck with a little effort.

I am preparing to built the online business in web Hosting..

All of these online industries tie in together in one way or another, but the bottom line is money.

One thing I do recommend is that if you are involved in any of the above that you use
Twitter as i have seen tremendous results from it.

Also another popular form of marketing that is gaining ground is Purl Marketing
It allows for a great deal of personalization when dealing with customers / potential clients.

eCommerce… I use the internet as marketing agent for my business and it is very effective..

i think, social networking still one of many online industries that promising. like the new one that i build. of course seo still an important thing to get visitor.

One thing I do recommend is that if you are involved in any of the above that you use
Twitter as i have seen tremendous results from it.

Currently i am involving with search Engine Optimization services and i am planning to join some affiliate programs where i can earn good commission. I need to study on web which affiliates will be beneficial for me.

My major in college is E-commerce, now i am a seor.