I have been wondering myself about this. I find that I spend too much time on the net (this is getting addictive). I use greenpoints and clickrewards. I also get clickrewards miles from answering questions for looksmartlive and through altavista - although that has become close to impossible lately (was nice when you click on several 50 point merchants). I have started to use milespree - which seems to go fairly fast and easy. Finally, I am using etour, but as someone said, more for seeing neat websites that for the points. My new discovery of the day (through e-tour) is that discovery.com is running a sweepstake were one of the prizes is 50,000 AA miles. So go register.