Jamawkinaw Enterprises has released Downcast 1.0.11, which adds an option to switch to audio-only playback of video podcasts. Selecting this option in the video context menu closes the video but continues playing the audio. The podcatcher app also squashes a bug that caused file extensions to be dropped for imported episodes, fixes priority play for playlists, ensures that statistics for partially played episodes are properly refreshed, fixes a problem that prevented the selected podcast/playlist from being reselected after a restart, and fixes multiple bugs that could cause crashes. ($9.99 new from the Mac App Store, free update, 6.4 MB, release notes)
Option-Click AirPort Menu for Network Details
If you hold down the Option key while clicking the AirPort menu in Mac OS X 10.5 Leopard, you'll see not just the names of nearby Wi-Fi networks, but additional details about the selected network. Details include the MAC address of the network, the channel used by the base station, the signal strength (a negative number; the closer to zero it is, the stronger the signal), and the transmit rate in megabits per second showing actual network throughput. If you hover the cursor over the name of a network to which you're not connected, a little yellow pop-up shows the signal strength and type of encryption.