The Hat List
* Visionary/Architect
* Lead Developer(s). AKA Hackers.
* Sysadmin
* Toolsmith
* Webmaster
* DBA
* Graphic Artist
* CSS Designer
* Content Creator
* Customer Support
* Tester
* Marketer
* Manager
* Lawyer
* Chef
The roles don't necessarily equally different people - the smaller your startup, the hats combine into larger multitasking sombreros.
The Sombrero List
* Developer
* Sysadmin
* Artist
* Marketer
Overall, I found this to be a useful exercise. Although I'd disagree with which hats are the bare minimum and how they'd combine into larger sombreros, it got me thinking about what my personal list would look like and it wouldn't be too different (remove Marketer & Sysadmin, add another Developer, rename Artist as Designer), so in that sense it was still pretty useful as a thought experiment.