Requested changes for registration

Edits #1.) http://www.mypinnings.com/register 
a.) remove the birthday requirement. 
b.) have the http://mypinnings.com/username shown all the time. It will check database in real time to see if the username is taken. Just like the twitter initial sign up design
c.) disable have the email is available real time search. If an email is already used, please just say in red: This email is already registered. Want to login or recover your password?
Also, make all the fields empty like twitter's.

Edit #2.) For http://www.mypinnings.com/register/after-signup, let's move things around a bit.
a.) Move the  "Select at least 3 to continue" to the top (this goes for select category and add items to profile).   Also, have a "skip" button for those that want to just go to account.
b.) make it so that I can click on anywhere and the category is selected.
c.) next step, instead of showing the item title, just show the image, when the user put the mouse over it, a button shows up that say "Get it"


Also, http://mypinnings.com/admin/input/ , please put the Category selection on the top so people will know how to select the category!!