From the  Wall Street Journal:
 
Investors and financial advisers are  preparing to take advantage of a new tax law that makes it easier to  gain access to Roth IRAs—even if it means breaking a sacrosanct rule  about Roth conversions.
Starting, Jan. 1, the $100,000 income  limit disappears for converting traditional individual retirement accounts  and employer-sponsored retirement plans to Roth IRAs, one of the biggest  changes on the IRA landscape in years. Roths, of course, have long been  viewed as one of the best deals in retirement planning; after investors  meet holding requirements, virtually all withdrawals are tax-free.
 
Just how many investors will make the  leap is unclear. Converting to a Roth can be expensive; it requires  paying income tax on all pretax contributions and earnings included  in the amount converted. What's more, financial advisers have long argued  that converting makes sense only if an investor can pay the tax from  funds outside the IRA itself - an admonition that seemingly limits the  strategy to the very wealthy.
That said, some financial advisers say growing numbers of their clients are leaning toward a Roth conversion, even if they have to tap their traditional IRAs to pay the taxes. The primary reasons: new, contrarian analyses of taxes and conversions—and a desire to gain more control over nest eggs in the years ahead. With a traditional IRA, investors must begin tapping their accounts after reaching age 701/2, which increases taxable income. With a Roth, there are no required distributions, giving retirees more flexibility in managing their investments and cash flow.