You can send me an email at firstname.lastname@example.org.
The best way to contact me is by Twitter. Not because I'm a technology snob, but because I'll be hugely grateful for you getting your message down to 140 characters. (If you're sceptical about Twitter, I wrote a Beginners Guide explaining why I like it.)
To get hold of me urgently, use my Swedish mobile:
+46 766 510 828.
If you need a real physical address for a letter or package, please make contact electronically first, so we can work out the best location for you to send it to.
There are all sorts of other ways to join the conversations that I'm involved in, face-to-face and online.