I had an issue doing this as well -- which I was able to resolve. Problem is, it was months ago, and I can't remember where my thread about it is (maybe in the maemo mailing list). I know it had something to do with the structure of my exported vCard and the strictness of GPE Calendar's import function, though...
Try searching for this issue here:
http://lists.maemo.org/pipermail/maemo-users/
I'll look arpund as well.
Tim
http://samoff.com