Ideally, I'd like to see a flat marginal tax starting at a high level -- something like $100k/year -- but (a) I'm open to alternatives, and (b) I really need to crunch some numbers to estimate expected revenues for various tax structures and levels, so we can figure out what rules would actually work to fund an acceptable level of government.
I have a particular pet peeve against market-based property taxes.
I like the idea of taxation by inflation (i.e. simply printing however much money the government needs in order to operate, or at least creating some part of its operating budget this way). Although there may be good reasons why it would not be workable, I have not yet heard a really good argument against it.