Disruptive Telephony

VoIP News yesterday posted an article "Hacking Skype: 25 Tips to Improve Your Skype Experience" that definitely makes for interesting reading (using "hacking" in the original sense of the word not the criminal one).  It's a good list of the kind of innovative things people are doing with Skype.  Many of them I'm already using... some were new to me and some I don't ever see myself doing (sorry, I don't want a lip-syncing avatar).  Are you using any of these?  What other hacks for Skype have you found useful?