I do hover and read!
Unfortunately life is never as simple as a short post in an open forum makes it seem.
masterblaster has suggested investing in US mutual funds can be a "good thing" because it gets over those nasty US PFIC rules. Unfortunately, the answer from a tax perspective depends on when you'll need the money (when you are living in the UK, after going home etc?), because the UK will never treat the gains on these as capital gains so the UK tax could be higher than the US tax on the gain (up to 40% in the UK even after April 2008, versus 15% currently in the US).
Similarly, an IRA defers US tax but saves no UK tax unless you fall within one of the few exceptions in the US/UK treaty and you claim under the tax treaty or domestic UK law on each UK tax return when you take lump-sum withdrawals or after you stop claiming the remittance basis in the UK.
These things are so much dependent both on personal circumstances (which change all the time) and laws in both countries (which also change all the time).
It is also worth cautioning that when masterblaster says he will not elect to claim the foreign earned income exclusion, this will mean he cannot claim this for 5 years hence, which may be a risky choice. He also says he will not pay US taxes on UK pension distributions when he takes them out. This is a significant undersimplification of IRS Code section 72 and the related IRS Regulations. If he reads these carefully he'll find that basis for US tax purposes is figured using an acturial formula, so in practice there will be some US tax on withdrawals.
I always defer to Guya's knowledge, and I too advise you to get professional advice, but as a US citizen in the UK who might be returning to the US someday, I've tried to come up with sensible financial solutions that I wanted to share to get folks thinking and I think that Guya is being a bit negative.
I wanted to invest some money and doing it in the US with a mutual fund account I already had seemed sensible as I'm not UK domiciled and the UK options seemed limited.
I've divided my money between a US inflation linked bond, and US and European Stock Index funds
I'm not doing a TIRA I'm contributing to a ROTH that I believe will be tax free in both the US and UK when I'm 59.5. I think commiting to taking the tax credit is worth it so that I can do a ROTH.
Finally I am trying to reduce my US tax liability on my UK pension by using excess foreign credits, as advised by Guya and Lizzit, thanks. Of course the US will want to tax the gains that I have in my UK pension fund, but when you go to a tax advisor I think its good to have some knowledge about this kind of thing, even if it is imperfect.
I know that this is all quite complicated and dependent on personal circumstances, but if we discuss what we are all doing we all might learn something and be a bit more prepared to evaluate and understand the advice we get. I'm a firm believer that you should understand everything in your finances and taxes and not just sign on the bottom line.