iZotope have just announced the latest version of their audio editing and restoration tool, RX5. Featuring several new tools including a new instant process tool, a reverb remover and a de-plosive module, the new version is due to ship October 7th. Between now and then, anyone purchasing RX4 or RX4 Advanced will qualify for a free upgrade when RX5 ships.
In the meantime, here's a couple of links for the full feature list of both RX5 and RX5 Advanced.