I just signed up for Oxford to Cambridge in September :-)
If you want to join me you can find out more and register here:
I've created a team "The Chain Gang" with "Eleanor Blair" as team leader, if you want to join that. I've still gone for individual membership though, since I don't have at least 6 team members. I'm hoping I can persuade some other friends with Oxford connections to join us :-) JDC? Juliet?
Addendum: I'm not intending to get their transport to the start, but will go on the train the previous day and hopefully find someone to put me up for the night. I'm sure we'd be able to provide crash space for non-residents of Cambridge after the event.