I have my registration form filled out but I haven't sent it in the mail yet... I didn't know that you had to put the registration number on the form... in fact, I just checked... there isn't any option for that. I went to check for a registration number on my Tikit that I bought in april, and infact there are some numbers just barely visible on the bottom bracket. I had to hold a flashlight obliquely to be able to read the last two numbers, the other ones are "erased" by the scuff marks of the cables passing by. So, yes, another registration numbering method would be a good idea.
For warranty registration, would sending back the receipt/purchase-order be a good idea? I'll probably wait also until I have a postcard of me and my tikit on the TGV in France.
And now that Rob English is a BF (Bikeforums) newbie, is this where we will go for customer service? Seems to work well for me!