IRA's are a great way to go. Lot's of tax advantages... But it does depend on your income level, there are limitations... Also, if you have kid(s) funding a 529 is another tax shelter investment.
Another thing I would look at is funding a life policy... You can give yourself interest free loans....
Lot's of options, but the best advice I would give is talk to SEVERAL financial advisors... There are a lot of things you can do to fund your retirement, and it is a very important decision.
I can't wait to take the money out of my 401k, that way I can start making some money!