I've pair programmed quite sucessfuly for several years. However, it is a very hard practice. It requires trust between people, first and foremost. Besides that, it requires knowledge that you can't do it all day. It is too intense and tiresome, and this lack of slack is bad for creative thinking. About the pride: it is like co-foundind a startup, where you build something toguether with other people (it is all yours).

Some other links:

- Dijkstra Pair Programming: http://c2.com/cgi/wiki?DijkstraPairProgramming

- Some notes on Pair Programming http://wp.me/puh71-1y

- How Pair Programming Really Works: http://bit.ly/5oOd4C

- Why I Don't Like Pair Programming (and Why I Left Pivotal): http://mwilden.blogspot.com/2009/11/why-i-dont-like-pair-pro...

- The real motivation behind pair programming: http://bit.ly/9DNurb