Of all the things you do online to make extra money, what's your favourite?

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With no money investment I'm guessing it's one of these things in this list, but I'm curious what everyone enjoys more. If your upto it, pick your top 3 and provide why you like to do it. (I've included things in the list, where you don't directly do stuff to earn but do receive money over time) 1)Paid to post written knowledge (like Squidoo) 2)Paid to post forums (like mylot) 3)Make Money from links (like linkbucks) 4)Paid to Review (like IM report card) 5)Playing Games (like dungeons and treasures) 6)Search and Win (like swagbucks) 7)Surveys (like mindfield) 8)Get Paid to Signup (like Inboxdollars) 9)Paid to Upload (Like Hotfile) 10)Data Entry (like work from home HQ or Microworkers) 11)Paid to Click (like NeoBux) 12)Tweeting (like Revtwet) 13)Paid to blog (like payperpost) 14)Traffic Exchanges (like WindyCityHits) 15)Social Networking (like Mypage5 or Yuwie) 16)From ads on Blogs/websites (like Google Adsense or Bidvertiser) 17)From Pictures (like ShareAPic) 18)Affiliate marketing product(s) (be specific about what you promote plz) 19)Ebay (like drop shipping) That was all the ways I could think of atm. If you want to know about of these ways of earning feel free to contact me , I'm happy to share knowledge about what I know. As for my Answer, I like to combine my pics + Links + bidvertiser (see my profile for link how to do that) to earn money the most, it may be slow earning at first, but the snowball effect is already progressing for me and starting to make some nice income, and it's residual requiring little activity from me. I also really enjoy the Search and Win field. So tell me what you enjoy the most.