If you like Greg Mackintosh's riffs you should really check out the album Icon. The guitar-work on that album is fantastic.
I forgot to mention Katatonia closing their set with the riff from Demon in my review, that was awesome.
07/31 - Windhand
08/06 - Neurosis
08/07 - Faith No More
08/22 - Motley Crue
09/19 - Godflesh
09/25-26 - Godspeed You! Black Emperor