From http://www.joelonsoftware.com/articles/fog0000000009.html (October 2001):

"I've been rather quiet lately on this weblog -- mainly because we've been working so hard at Fog Creek getting ready for the beta of CityDesk, our flagship product."

I have been reading Joel on software for quite a long time, I remember reading that fogbugz was just their home-grown brug tracking system, not intended to be a real "product" at the beggining.

I also remember how Joel used to argue that citydesk would win because no one would like to write a blog using a web interface...