A couple of good ones here.
http://www.youtube.com/watch?v=SeCuCwnLbzs (http://www.youtube.com/watch?v=SeCuCwnLbzs)
http://zebox.com/lamph/ (http://zebox.com/lamph/)
Davy Fitz:
http://ie.youtube.com/watch?v=BYc6DV_HirQ&feature=related (http://ie.youtube.com/watch?v=BYc6DV_HirQ&feature=related)
An older one:
http://www.youtube.com/watch?v=_JHOpRsb1Y4 (http://www.youtube.com/watch?v=_JHOpRsb1Y4)