The default font used in emacs doesn't show the euro sign correctly. Well, it uses something that looks *somewhat* like an euro sign but definitely isn't ...
Forgot: I'm using LANG=de_AT@euro
Regading that *somewhat* euro: I checked again, it is the euro currency symbol, although very ugly ... will file a bug in XFree86-ISO8859-15-75dpi-fonts for that one. Closing.