I've got 1038 contacts on my N900.
I sync N900 with Soocial.com. At Soocial.com I've got my contacts with name, email, phone number, picture and skype address.
When I sync with N900 everything is ok, except skype. Skype address doesn't sync.
The same happens when I export my contacts from Soocial and import them to N900 or Mac Address Book.
So, when I connect my N900 to Skype, I've got some contacts duplicated...