Probably nothing. That stupid registration page is broken more often than working. Don't worry about it, registration is optional.
If it is a new PSPgo all you have to do to get the free games is login to PSN using your account. Use your existing account if you have one, or create a new one if this is your firsat time on PSN or you just want a new one (but be aware that on the PSP you cannot share content between accounts like you can on the PS3). So just enable an Internet connection on your PSP, set up your account, then go to the PSN store. That's it. Sony will email the game code to the address you use as your login. It could take anywhere from a few days to a few weeks, so be patient.
Everyone thinks I'm psychotic (except my friends deep inside the earth).
your guys' converstion is really funny. By the way, would you please give me a link to a website which accept register barcode. I want to set similar barcode reading function in my own website after I analyse several similar functions.
Here is a good barcode site which may be helpful for you. You can find various barcode generators and scanners there. I have been using their C# barcode generator for WinForms for months. By the way, there are many useful passages about barcode creation there, like this guide of barcode data encoding in C#, etc.