After a quick look at Homegate - yes there are loads more properties than a year ago.
Interest rates have gone up considerably since 2006 and jobs aren't as secure. Securing a mortgage may be more difficult now (as in the UK) and properties are taking longer to sell and need to be marketed (and not snapped up by bank employees beforehand). Perhaps people selling up after loosing their jobs and moving back home too.
As for the credit crunch's impact on Switzerland:
Friends visiting us from the Freibourg area yesterday said they know of 2 family friends that were asked by their local Kantonal bank to pay the outstanding amount on their mortgage.