I am young (28, everyone on this forum tells me this is young) and have been biding my time until 2012 to convert my SEP into a Roth IRA...my wife started school, so her not working lowers our tax rate. Seems to be prudent to switch to a Roth early in your investing career or other low tax situations, when your income is less. Give as little to the man as possible.
The Roth cynics have warned me that in the long run, congress will not be able to keep their hands off the Roths and will implement a tax to get us again at withdraw. Can't say I disagree with their cynicism but I'm sure you will still come out way ahead vs. not converting in the first place.
PS Greg, I put some of my money where your mouth is today...did you feel the bump in your portfolio?
Steven