Been around for several years, and only has 2 albums out, their self-titled debut album in 2003, and their newly released album, just came out this year, "Soundtrack for the voices in my head". Also, if you check the credits on some of the songs by Circle of Dust or Argyle Park, you can see that they help a lot with those groups as well. It's rather hard to define what sub-genre they are classified as, as they tend to switch between rock and electrorock, and occasionally make forays into other sub-genres as well. I will make a list here with each song and which sub-genre it goes into, as well as youtube links to each song so you can listen to it.
Celldweller album
Switchback - Electrorock
Stay With Me (Unlikely) - Rock
The Last Firstborn - Electrorock
Under My Feet - I dunno what it really is, but sounds like ambient rock to me
I believe you - Rock
Frozen - Rock
Symbiont - Rock (but with electrorock influences) [note] typed that last bit while listening to the song and heard the line 'We're dancing on a thin line' and it just seemed so appropriate.
Afraid This Time - acoustic electrorock
Fadeaway - Rock
So Sorry To Say - Rock
Own Little World - Electrorock
One Good Reason - Industrial rock is what it's properly called, I think. Correct me if wrong.
The Stars of Orion - Electrorock
Welcome To The End - Melodic Electrorock?
Shapeshifter is a standalone release that was done with some other band that I can't remember the name of atm, but it isn't on the self-titled debut album, nor on their new album.
Shapeshifter - Rap-electrorock
Soundtrack For The Voices In My Head album
Through The Gates - Electrorock
Birthright (Beta 1.0) - Electrorock with orchestral influences
Solaris - Rock
I gotta go to bed now I'll finish in the morning.