Making my Technorati rounds searching for InfoPath community content, I came across two very cool articles:
1) InfoPath 2007, Forms Server, MOSS 2007 by Sahil Malik: start from a Word form, publish it to be filled out in the browser, play with the content type and configure the document library. Fun read, and lots of screenshots.
2) InfoPath Forms for Mobile Web Browsers by David Gerhardt: good starting point if you're exploring your way around the mobile forms arena. (UPDATE: Fixed link)
Alex WeinsteinProgram Manager