Michael Arrington of techcrunch.com has written (updated) a very handy article listing some excellent Web 2.0 companies you should get to grips with. I can’t say I use all of them but I do use a fair few (Flickr, Gmail, Netvibes, Digg, Wordpress, Skype, Youtube), and I love them. I dare say I’ll be signing up for a few more, and hopefully with the increased convergence of web services, 2007 will see people adopting and contributing to sites such as netvibes more frequently.