Here are some ways of generating income from the internet

Social networking
Blogging
Message boards
Stock photography
Surveys
Games
Freelancing
Poker
Selling
Doing something crazy
Offer your professional expertise in an online marketplace
Provide service/support for open source software
Online life coaching
Virtually assist other web workers – virtual assistant
Write reviews for pay or perks
Rent out your stuff!
Build a Niche Store
Amazon Affiliate Program
Clickbank
Commission Junction
eBay