Global Delight has released Voila 3.7, adding support for recording HD screen captures at 60 frames per second. The update also offers the option to downscale screen captures from Retina displays; adds native tagging in OS X 10.9 Mavericks; adds support for sharing videos via Facebook, Twitter, Flickr, Vimeo, Messages and AirDrop; adds a timer for setting the duration of a recording; and provides an option to append the date and time to the filenames of your captures. ($29.99 new from Global Delight with a 25 percent discount for TidBITS members or from the Mac App Store, free update, 26.4 MB, release notes)
View Extra Audio Details in Snow Leopard
In Snow Leopard, Option-clicking the Volume icon in the menu bar displays a list of sound input and output devices. Choose one to switch to it; it's much easier than using the Sound preference pane. Also, hold Shift and click the icon to set the system volume, which is separate from the general output volume.