Traditional IRA conversion to Roth IRA in 2010.

Yes.  You need both 5 years and 59.5.

Reg. §1.408A-6

Q-5. Will the additional tax under 72(t) apply to the amount of a distribution that is not a qualified distribution?
A-5. (a) The 10-percent additional tax under section 72(t) will apply (unless the distribution is excepted under section 72(t)) to any distribution from a Roth IRA includible in gross income.
(b) The 10-percent additional tax under section 72(t) also applies to a nonqualified distribution, even if it is not then includible in gross income, to the extent it is allocable to a conversion contribution, if the distribution is made within the 5-taxable-year period beginning with the first day of the individual's taxable year in which the conversion contribution was made. The 5-taxable-year period ends on the last day of the individual's fifth consecutive taxable year beginning with the taxable year described in the preceding sentence. For purposes of applying the tax, only the amount of the conversion contribution includible in gross income as a result of the conversion is taken into account. The exceptions under section 72(t) also apply to such a distribution.
(c) The 5-taxable-year period described in this A-5 for purposes of determining whether section 72(t) applies to a distribution allocable to a conversion contribution is separately determined for each conversion contribution, and need not be the same as the 5-taxable-year period used for purposes of determining whether a distribution is a qualified distribution under A-1(b) of this section. For example, if a calendar-year taxpayer who received a distribution from a traditional IRA on December 31, 1998, makes a conversion contribution by contributing the distributed amount to a Roth IRA on February 25, 1999 in a qualifying rollover contribution and makes a regular contribution for 1998 on the same date, the 5-taxable-year period for purposes of this A-5 begins on January 1, 1999, while the 5-taxable-year period for purposes of A-1(b) of this section begins on January 1, 1998.