here, here, here and here. See The Guardian 14th September 2010.
Addendum 15th September: - CharonQC takes a brief look at "what if" the Supreme Court rules in favour of the MPs.
Addendum 16th September: - "MPs' expenses case hinges on limits of parliamentary privilege" - Joshua Rozenberg - The Guardian 16th September. A nine judge court is to sit.
Addendum 20th September: - "Secret Deals still being offered to MPs" - Rosa Prince in The Telegraph 20th September.