MSN Money Central has an interesting article on how to retire at age 40. Basically, if you save 20% of your income for 20 years and invest it you will be able to retire and have the same standard of living. That is a pretty extreme way saving and investing but doable for many people.
To combat inflation you could work another 3 years and get a 4% raise each year. A simple and easy way to save money is the idea of "paying yourself first", in other words have your savings, investing and charity taken out of your paycheck or income that way you never see it. Not paying yourself first is like having a loaded gun, you will spend it.
If you meet the requirements of a Roth IRA you should be maxing it out, it really is a no brainer. I recommend ShareBuilder.com which allows automatically invest money into stocks or funds for just $4. Another great simple and automatic way of investing is by opening a Vanguard account which allows you to buy a huge variety of index funds like the popular S&P 500.

Retire Young, Retire Rich
MSN Article
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