There's an interesting discussion here: http://www.sublimeoblivion.com/2010/03/10/transition-reckoning/ comparing the changes in per capita (PPP) GDP in various post-Soviet countries (and Poland) since 1989, tracking the economic decline through most of the 90s and the economic growth that occured in most places thereafter.
I knew most of it before, but it's rather startling to see it laid out in nifty grafts. The big winners are Belarus at about 170% of 1989 (no surprise there) and Armenia (!) and Azerbaijan at 170 and 200%, respectively. The big losers are Tajikistan, Moldova, Georgia, and Ukraine, which are the only ones still at pre-1989 levels.