When I tried to sign up for a Sedo account, it says

Unfortunately your entry contained errors. Please review the fields marked in red and correct your entry.

But there's no entry marked red! Does anyone experience similar problem?

In addition, is Sedo a good choice for domain parking? I have 2 domains registered at 1and1 and 3 domains at GoDaddy that I want to park. What are the good domain parking company for my use? Thanks a lot!

For your sign-up problem it's the best to contact sedo support.

Sedo performs on some domains quite good, mainly when you have international traffic. For mainly US traffic Trafficz and DomainSponsor perform quite well.

rony is right, i know that sedo performs amazingly well with european traffic.

Does Sedo has a minimum number of domain requirement? Many services require at least 10 domains. In general, what are the good domain parking services that do not have such requirement and is free? Thanks

What is the email account you are using to signup?

Sedo doesn't accept sign-ups with free emails like gmail or hotmail..