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.
04/24 - Nile
05/18 - Abigail Williams
06/20 - Negura Bunget
07/04 - Agalloch
08/23 - Alice in Chains
12/06 - the Music of Final Fantasy