The CTC issued a report today confirming that more cyclists on the road does indeed mean less chance of an accident. Safety in Numbers is a 5MB downloadable PDF. A few papers have picked up on the story, such as the Guardian.
The barchart on page 2 lists 2007 fatalities by mode of transport: both users killed, and others killed by those users. The figures are Car 1432/1049; Lorries 110/423; Motorbike 588/40; Bus/coach 12/84; Pedestrian 540/2; Cycle 136/5.
As the report points out, more cyclists doesn't just increase safety for those of us on bikes. It also reduces the number killed collaterally, because some car journeys - which are as likely to kill those outside the vehicle as inside - become bike journeys, which are extremely unlikely to kill anyone not riding the bike.
And you do wonder how those two unfortunate people managed to be killed by pedestrians.