[twitter-dev] Now that oAuth tokens expire, how can I do stuff for the user when they're away?

[@pud]

Hi,

I realize a precaution taken during the recent oAuth scare was to
expire access tokens relatively quickly.

Let's say I have a service that automatically sends tweets for a user
on a scheduled basis (like when they update their blog).  The last
token I have is 48-hours old, and is expired.  How can I send this
tweet?  Is there any way for me to get a new access token when the
user is not around?

Help.

Thanks,
@pud