When I started to record pronunciations for Wiktionary, I used Audacity. It is a great tool but hey when you are a serial recorder, you want to have a tool that assist and helps you to do it it efficiently. Shtooka is a great tool. I think I blogged it in the past.
Now they have surpassed themselves. There is now the Shtooka explorer. It allows you to listen to the many, many pronunciations in several languages they have recorded. It is an absolutely gorgeous application that really shows off an already great project :)