Same as this year, 5000km. I unfortunately didn't manage this year because I had a nasty crash at the beginning of November and am still basically recovering from it, I'm at around 4300km.
2009 was the first year that I decided to cycle a lot more, with long distance in mind. I've had road bikes since I'm a kid, but I don't think I ever cycled more than 1000 km in a year before. I drew a lot of inspiration from this forum, I even built myself a long distance bike and what I've read here was a great help.

It should be easy to cycle more than 5000km in 2010. I have registered for my two first brevets and I'm really excited about it, 200km at the end of March and 300km at the end of April in Osterdorf, Germany, organized by the ARA NordBayern.