iStumbler is an easy way to scan for information about the Wi-Fi environment around you, as well as see available Bluetooth devices, and what Bonjour services are available on the local network. The latest version, release 99, works only with Mac OS X 10.6.2 or later, adds support for the 5 GHz band used by 802.11a and 802.11n, and takes advantage of the coordinate-based location feature in Snow Leopard to allow GPS-like tracking as the application scans. (Free, donation requested, 1.1 MB)
Remove Excess Audio/Video from a Pear Note
If you ever find yourself in a situation where you used Pear Note to record a class or meeting, then forgot to stop the recording and ended up with an extra few hours that you didn't want, don't worry. You can crop off the extra recording. Just move the playhead to the end of what you want to keep, then select Crop Recording From Here from the Edit menu.
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