I’ve created a wiki at wikispaces.com, to document things that are less transient than a blog entry.
Take a look at http://timwise.wikispaces.com/
I’ve started adding information about the car pc, and won’t make any promises about what else I’ll be adding (personal motto: under promise, over deliver).
I’ve made it open to all editors, and licensed under the GNU Free documentation licence to ensure the maximum value, reach and participation.