One way to avoid 40% CGT is to invest in mutual funds through an IRA. Albeit, you can only invest up to $5000 in 2008 and you cannot already be a part of a employer sponsored plan (401K for example).
It will be interesting to see how the nondom tax issue plays out when the budget is announced. I know Darling has taken a lot of heat from industry associations and financial institutions who have threatened to leave the UK if the tax is imposed. It would have been fair for him to have a sliding scale tax - because the proposed law, as it stands, still benefits the oligarchs (30K is a drop in the bucket for them AND they don't have to disclose nontaxable offshore assets) and punishes those who are not in that bracket. However, the nondom tax is only applicable for those who have stayed here for 7 years or longer without filing to become a UK resident. So again, if you've just moved here, the point above on the nondom tax is somewhat moot. Correct me if I am wrong.