The best way to making money online...

I wouldn't do any of the things you suggest, except maybe a little for fun if that's what I wanted.
No, for me it would be playing the stock market and currency markets. I'd make sure I had a balanced portfolio in different sectors and different areas of the world and with the instant dealing on line, I would be able to buy and sell at an instant as opportunities presented themselves.

I would also be using the net to look at property opportunities right now!

At the moment, I just have a certain amount of money allocated and use that. I'm more than happy with results over the years but more money would mean lots more opportunities.
The one one I have learned is not to over-react with the markets, thats a sure way to sell at the bottom and buy at the top when you want to do the opposite.
So recognising when to buy and sell, not being too greedy, take some profit when its available and even being realistic about taking a loss at certain times. Of course I've made lots of mistakes too but thats the best way to learn.

Hmmm stock markets, good one.

Forget all that expensive web development and hassle, just dump a couple of hundred grand into RBS and Lloyds and sit back and wait for it to grow.

Then work out the best way to get round CGT