http://www.spock.com/Michiel-de-Boer-TrrD1uS (check out my 'Spock Power')
On Plaxo I don't know if I have a unique URL yet. But you will find me through the China Business group I started on:
What I like about Plaxo is the fact that it is easy to import feeds from other platforms. But I do not completely trust them (yet?). What I like about Spock is the simplicity. In both cases, I doubt if they will mean more to my business then LinkedIn has so far.
If you want to connect without using Spock or Plaxo, you can still find me here:www.xing.com/profile/Michiel_deBoer3
Hope to meet up with you anytime soon!
PS Almost forgot, I'm here as well: http://community.globeforum.com/profile/michiel_deboer