1. Plaxo
Plaxo was founded by Sean Parker, the man behind Napster (remember?).
It is a great, fully Outlook-intergrated P2P based application. However, when I installed it last December, it was running quite instable on my 3.000 contacts. Also, unlike GoodContacts (cf. below), Plaxo supports automatic updating of information for fellow Plaxo users only.
2. GoodContacts
GoodContacts [...]
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