David Boaz at Cato says Ayn Rand is in. Maybe. I've heard book sales are up. But you've gotta compare it to the competition. I haven't data on relative book sales, but we still have Google search data.
Google Search Insights shows a mild up-blip in Rand-related searches in the first quarter of 2009, then a drift back down; searches on Marx continue to dominate both in volume and in linked news stories. Boaz also notes resurgent interest in Hayek; Google Search Insights says nothing to see there.
Again, Marx in blue, Rand in red, Hayek in yellow. Clicking through on the Google link shows that in none of the top-ten Rand countries does Rand beat Marx in search popularity. Hitting any of the tags below will bring up previous iterations of the Rand vs Marx on Google Search Insights; do check there to see if your immediate objections to the use of this method have already been answered.