Update (29 Dec 2012) The author has already update CircuiTikZ (Thank you, Massimo!). It should be integrated into the CTAN official repositories in a few days. The package is now hosted in Github for ...
Stemming from this question and with due credits to @morbusg's answer, I was able to create a very fundamental symbol for the circuits.ee.IEC TikZ library, the AC voltage source. I call it the ac ...