Among all, aweber is probably the most reputable one. But I find the approving process ( on the verification message and importing list) annoying - especially they putting the 'human element' on their review process. CampaignMonitor works wonder for me, but unfortunately too expensive.
Share your experience and discuss on the email marketing / autoresponder tool.
I have been using aweber for a year now, and I really find them to be the best. No problems whatsoever. I have tried many and the next good one is GetResponse.
I tryed Google adSense for advertising my website, but I was not very happy with the results I got.
I also tried email advertising on different networks and it seemed to me that taketheinternetback.com ads delivered quite good results in terms of generated visits and conversion.