Offering preliminary support for OS X 10.8 Mountain Lion, Rogue Amoeba’s Audio Hijack Pro gets bumped up to version 2.10.4 with an updated Instant On component (now version 6) that improves overall system audio capture. In fact, the Instant On component is now required for capturing audio from Safari and QuickTime Player when running Mountain Lion, as well as when snagging audio from a Fluid app. ($32 new, free update, 5.2 MB, release notes)
Show Recent Items in Snow Leopard
The Recent Items submenu in the Apple menu is handy, but what if you want to work with a file in there in the Finder, rather than open it? Just press Command when that menu is showing, and all the Applications and Documents change to "Show ... in Finder." This feature is new as of Mac OS X 10.6.3 Snow Leopard.