My name is David de Kloet (and my middle name is Sebastiaan).
In most places where I register I register as dskloet and I expect all instances of dskloet to refer to me. Places where I have identities:
Google+
@gmail.com
@manabase.com
Skype
MSN - as davidmsn at tiscali.nl
delicious
TopCoder
USACO
- as dskloet1
Project Euler
Orkut
Reddit
Facebook
Twitter
youtube
last.fm
Wizards Community
- as Vello
MOTL
magicforums.nl
- as David
PicasaWeb
... and more places I'm forgetting now.