Had a closer look now at task4dollars.com and registered.
Looks all quite professional. I like the account pages. They are easy to navigate and are easy to understand. Clicking ads seems to work similar to coin of midas: 30 Seconds timer followed by an easy captcha. Ads clickable only once per day.
Free account get's 20% reward for clicks and tasks from referals. If you want to get more out of referals (50%) you have the option to pay for a one year premium membership.
Sadly there currently weren't any crowdflower tasks available will look into that later on. But provided the number of ads and tasks increases this should be another good way to make some free BTC comparable in payout to the other porminent services.
Another suggestion: Would be nice if I could change the currency in which rewards are shown to BTC instead of $.
Thanks for the words. Concerning showing rewards as BTC instead of $, that will go another level of configuration. I will certainly add a description of how much $ worth 0.01BTC for example. With this, you will not find the system confusing. And concerning the availability of tasks, there are few tasks available now for international members, but i think US, UK, CA, and AU members have much more tasks available. Though my tasks channel for tasks4dollars is new, it will take few more days to get all the tasks added. Unlike dollarrewardz.com that has many tasks as an old tasks channel.