gApps is unusable, I don't know how they do it
there is no, zero, i mean absolutely no support for contacts as I understand them (data fields, GUIs, bidirectional synchronization (hell, even unidirectional synchronization) are all absent and/or impossible).
Do this if you doubt me. Take a reasonable contact list (let's say 500 contacts with an average of 10 data fields (addresses, phones, etc) in each) import them to gApps/gMail then export them and reimport to your source contact manager (phone/program/whatever). Your data will be mostly gone and what remains will be so hopelessly mangled you may as well shoot yourself.
Which is what I wanted to do after a 2 week review of gApps where I tried EVERY workaound imaginable to their contact non-management left me despondent.
I ended up keeping my clients either on Exchange or in Yahoo.
Too bad the rest of gApps isn't bad.