Well, apparently BAR have been using a reserve fuel tank to make sure the car was on the weight limit. That nmeans it's been deisnged into the car, and that is breaking the rules.
If that is the case then they should be thrown out. Blatant cheating (not that it got them anywhere!) will always bee frowned upon. The precedent is when Toyota were found to be using illegal turbos on the Celica WRC car and were thrown out of that year's championship and banned for a further year.
If it's a case of being sneaky with the fuel, then strip them of the Imola result, and fine them. The FIA situation is still finely balanced, but I reckon all the teams will fall into line anyway, so long as the money is right.
So far, you have Ferrari and possbily Red Bull on one side, the rest on the other. More interest is the possible takeover of Sauber by BMW, because that will have a massive impact on Williams and even Button's ideas about joining them. BMW gets an up and coming team with it's own wind tunnel and aero team.