I can not stress this enough! You absolutely need to install Roboform. The trial version is free and you wouldn't believe how quick, easy and fun it makes filling out all the lengthy forms the survey companies have you fill in. If you're serious about getting paid to take surveys, you won't regret this.
Oh, and don't forget to check and verify your email after you sign up with the companies.
This list is by no means finished - I have over 1600 companies to re-sort through!! So check back often!