I see the same symptom as scurrie - it says the import was successful, but it wasn't. I've checked inside the contacts file and verified that no data is being imported. This is using the same vcf files that imported successfully to GPE Contacts previously in OS2007. Even the simplest vcf file won't import correctly.

I installed the most recent OS2008 version from Graham Cobb's repository at http://www.cobb.uk.net/apt/ (2.8+maemo+syn20080114-1 gpe packaged with mud). From the description of work in progress there it looks like things are a bit unstable with the OS2008 release at the moment. The package name suggests that there was a new build 2 days ago.

If your version is working to import a vcf file on OS2008, perhaps you installed a different version or an earlier version?