On 3/20/2007 9:54:34 AM, Ron Rosenfeld wrote:

The odd/even rules only apply in "uncontrolled"
airspace.

Perhaps in theory, but in reality (and speaking from primarily a northeast US
experience) ATC does prefer to utilize odd/even IFR altitudes. At least once
every couple of months I hear clearance delivery at my home class C airport
in the northeast US point out to a pilot receiving an IFR clearance that
his/her filed altitude is incorrect for direction of flight. In each case, CD
then suggests a "proper" altitude that is accepted by the pilot.

--
Peter