I try to register my account but the email activation never comes, even if I tried another email account.
Yikes! It seems our recent forum upgrade has caused problems for UnityAnswers users that use their unity forum handle to log in. Sorry about the incnovencience, we'll try to fix this.
I'm having the same problem. I registered this morning and I'm still waiting on an activation e-mail
I too am having that problem. I registered twice and both times the email was not sent.
Edit: I got my email now. I figured the site was just having some temporary errors. I was just too sleepy to remember to add "Don't worry I'm sure it'll be fixed in a day or two.".