Now that I’m using my Mac at least as much as my PC at home, a cross-platform sound editor seems like a good thing. Not having to buy one seems like a good thing, too. Audacity is a free, open source, sound editor that works on both the Mac and Windows. On Windows, I’ve already got Sound Forge, so I don’t know how likely it is that I’ll use Audicity there. Just depends on how easy/stable/featureful it is.