If you are an occasional ORP user you may want to see the changes Mr Welch has made to ORP recently.
05/06/2014: Exempting Social Security Benefits from State Income Taxes
05/10/2014: Taxes on IRA to Roth IRA Rollovers
03/10/2014: Seperate Life Expectencies
02/10/2014: File and Suspend
01/11/2014: Spousal Benefits
01/04/2014: Mortgages on Illiquid Assets
. . .
One I find useful is the ability to configure ORP not to do ROTH conversions. This allows one to run the model with ROTH conversions, and without. This allows you to quantify the value of ROTH conversions.