Communicate Coughing -- If you try the Communicate Lite demo mentioned in TidBITS #199, and you leave it connected but idle in the background, it will make a slight coughing noise every five minutes to let you know you are still connected, much as AppleLink does. The reminder helps you to avoid running up a phone bill or running down a PowerBook battery. If you don't like the sound, you can turn it off, pick another one, or increase the time between reminders.
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Show Hidden Files in Open/Save Dialogs in Snow Leopard
In Snow Leopard, if you want to show otherwise hidden files in Open and Save dialog file lists, just press Command-Shift-period. Pressing it again hides the files.