Introducing Plaxo 3.0, the only online address book and calendar that syncs with Microsoft, Google, Yahoo!, AOL, the Mac, Thunderbird, and your mobile phone! ItWire talks about Plaxo.

Having all of the above address books scattered across the web makes it impossible to keep any kind of continuity, or your sanity. Personally, I try to memorize as many phone numbers as I can. But there is only so much your cortex can contain, and the way email address are getting today, longer and longer, it would be impossible to retain all that information without hemoraging. There is a good slogan for the website:

Use Plaxo! Prevent hemoraging!