CA license renewal please help me

Hi,

I initially got registered in CA but didn't work there not even one day. Because we live in kansas, i got registered in kansas board & working since 1 year. We don't have any plan to move to CA & work there. But my RN license from CA will get expired in june 2009. Since CA is my primary state os registration, for any reference like hospitals, universities or to register in another state they are asking to send a letter from CA but not from CA.
Now please tell me do i need to renew my CA RN License for future purposes. or is there any other choice?
or if i request CA board to keep my license at inactive status, and if i need any reference from CA will they able to do that since i'm on inactive status? in future if i want to work in CA how to reactivate my license?do i need to pay the renewal fee again?
Otherwise if i don't renew or inactivate my license on june 2009 what will happen? can i get any endorsement form or references from CA board in my future?

please kindly answer my questions.
Thanks in advance.
Lilly.