You can just sign up with another E-mail.
That's how you sign up again to anywhere you are banned from.
All the accounts I've given Chaim have unique email addresses as well.
Here is what I do:
1. Login into my Gmail (google mail) account and send myself a bunch of invites (to open new Gmail accounts). Logout of Gmail. Logout of Youtube if logged in.
2. Go to Youtube and Gmail (google mail) in separate windows
3. Think up a name. Make sure it's available in both YouTube and Gmail (to make things simple)
4. Sign up in Gmail with that name.
5. Sign up in Youtube with the same name giving the Gmail address as my email address. Use the same password as for Gmail.
6. In the Gmail window, click on the Youtube link to confirm the email address
7. Sign out of both Gmail and YouTube
8. Lather, rinse, repeat
9. Send Chaim the list of addresses.
The same could be done with Yahoomail or Hotmail, I presume.
Gmail seems to limit you to 9 or 10 in a time period, based on your IP or cookies or something. But overall it's easy. The process is not complicated...I do it while watching the news (or listening to AskJTF! :-)