Bruce Byfield has a nice article A Field Guide to Free Software Supporters. On his typology I’d be in between 4) Softcore advocate and 5) Mainstream advocate.
What struck me when reading it was whether pretty well the same categories could also describe people’s attibutes to Standards (and Open Standards, Open APIs, Open Systems)? Not a bad fit, with different names sometimes. In that category I guess I would be somewhere between 6) Hardcore (see All Interface Technologies by Market Dominators should be QA-ed, ZRAND Standards!) and 3) the participating idealist (because the standards issues I participate in are the ones involved in my day-to-day jobs in the markup/industrial publishing industry).