Myster-emails is shutting down. They are finishing off the ads they still have then thats it. I suppose most people didn't believe it was worth their time because of the 0.015 cents (yes cents not $) ads, but they didn't realise that there was also 2-3 1cent ads a day, so it would have been possible to make as much as on advercash/bux.
Clix4coins is being called a scam because they have changed the system. I will wait and see then tell you if it is a scam. Basically they are giving credits for the ad clicks, credits have a value based on advert revenue, so basically the more money the site makes from ad clicks the more they will give us! But since they can't ask people to click on their ads it's to hope the users will be bright enough to figure it out for them selves!