SuisseID, OSX, OpenSC, and Quovadis
after a lot of fiddling I turns out that OSX 10.6 is not supported (at least not fully) by Quovadis' SuisseID implementation. I could not get the certificates to show up in the Keychain so that I could use them with the Mail application.
However, I did come across opensc (link) and this seemed to work wonderfully well and since i installed it I can see the certificates in the keychain and a separate chain and send authenticated emails from the Mail.app.
For some reason I did notice a high CPU spike for the pcscd application, i'm not sure whether this is a anomaly or a result of running opensc, I killed it and once I re-inserted the application it once more spiked 
update 10/05/2011: the friendly people from Quovadisglobal.com gave me a pre-release piece of software that support the SuisseID (software is called Sign!) under OSX 10.6. I instaled it and it works like a charm! nice work Quovadis!