I spoke to Kris Kylven of UX during Alternative Party 2008. I worked up the nerve to thank him for the amazing gig.
Remu Aaltonen of Hurriganes fame. Saw him around Kaapelitehdas for some reason. I noted my friend "That's fucking Remu Aaltonen". I don't listen to Hurriganes but he's some form of celebrity figure in Finland.
DJ Malakai during a Calmando Qual (yes...) gig. He played a set there before the main artist and I also saw him there outside of the set. I also saw him play at Altparty at some ludriculously late/early hour and I was one of the four people present during his set there.
During Konemetsä I saw the guys of Mr Velcro Fastener on the festival area.
I also saw one member of Accu on the festival area.
And some few more unsure ones: