Scoble posted an article entitled Things I don’t do and starts off by stating that he won’t do Plaxo and won’t do LinkedIn.
What a loss on his part!
Maybe for someone so well known, he isn’t looking for ways to stay in touch with people - perhaps he already has too many people to stay in touch with. But for myself, as a young professional who has been through 4 jobs over the past 5 years, these services can be lifesavers by allowing me to easily stay in touch with contacts from previous jobs that I might otherwise lose touch with.
If you haven’t checked them out, give them a shot - both services are free and should still be able to provide a return on your investment.