A lot of the work in starting up a startup involves mundane things like setting up servers, version control, feedback links, testing, etc. There's really nothing to see there.
I'm tempted to open up my Subversion repository eventually (I started checking into svn after 1.5 weeks, when the app was basically nothing more than a login page), but I can't really do that until:
a.) We've launched, so that we actually gain any of the publicity benefits of being an "open" startup
b.) We have enough of a technological lead that it wouldn't be disastrous to have someone download the svn repository and immediately setup a clone. LiveJournal, for example, has gotten about zero leverage out of being open-source and had to deal with some fairly significant hassles.
Really early feedback can help me build a better user interface for example.
en.gibney.org/javascript_software/