Many, many inspirationals for me.

Bela Fleck and the Flecktones (and Vic Wooten as a bassist)
Igor Stravinsky
Arnold Schoenberg (doubly so at the moment)
Toru Takemitsu
John Cage
Olivier Messiaen
Pierre Boulez
Stan Kenton
Bjork
Feist

Just... so many, could go on and on and on and on.

I think though the most inspirational people are those brave enough to pursue what they love irrespective of any criticism, lack of support and/or financial hardships that may occur.

Just off the top of my head,

Bernard Parmegiani
Francios Bayle
Oren Ambarchi
Rolf Julius
Robin Minard
Daphne Oram
Delia Derbyshire
Alvin Lucier
Brian Eno
David Byrne
Jim O’Rourke
Steve Albini
Demdike Stare
Deaf Centre
David Bowie
Lambchop
(late period) Talk Talk
Jason Molina
Ry Cooder
Richard Thompson

bjork,
Colin Stetson,
Ravi Shankar,
Elbow,
Klaus Schulze,
John Cage,
Eno,
Messiaen,
Ryoji Ikeda ,
Autechre and Aphex Twin,
Beck,
Tom Waits,
Boredoms,
Disasterpeace,
So much good stuff...

Daft punk
Starscream
In Flames

This is going to sound like such an ass kiss buuuut mainly people in the scene :

Cheapshot, Minikomi, trash80, little-scale, Alex Mauer, Virt, Anamanaguchi, Chaos Royale, Hally, Q330, Dubmood, linde, G & J, Hizmi, sabrepulse, 4mat Elwood.

Please a few non sceney people : Tim Follin, Tom Waits, Madeon, The Kinks, The Zombies, Big Star, Queen, Eero Johannes, The wildhearts, pixies, quincy jones, zztop, Amy Winehouse, LOADS of showtunes,

whenever I'm writing I find myself very easily swayed from doing so-- working with LSDJ can give you a headache or sometimes just listening to the same patterns over and over again can get very grating and boring.  However, I find myself (when writing/composing music) with a greater predilection to do things entirely removed (one foot in, one foot out, whatever) from music.  Sometimes listening to music is helpful (covox, NNNNNNNNNN, Nullsleep, Bit Shifter, Bokusatsu Shoujou koudou) , but more often than not I usually sit down and read, or watch internet.

IMPORTANT FOR BRAIN:  Dr. Seuss, H.P. Lovecraft, Robert E. Howard (these things help my brain move freely without the constraints of what could be construed as 'normal brain patterns')
IMPORTANT FOR SOUL: Minecraft, 'The Cabinet of Dr. Caligari', 'The Phantom Creeps', The Muppett Show

Seriously, that is pretty much the sum of everything that goes into my music/composition. 

I constantly roll this simple thing over in my head--

Dr. Seuss wrote 'The Cat in the Hat' using only a list of 200 words, and followed up with 'Green Eggs and Ham' using only 50.  His ability to convey morals and teach reading concepts with constraints/rules reminds me very much of programming with LSDJ/nanoloop.  The 'less is more' ethos is sometimes very easy to lose sight of, but with so many great artists having created so many great pieces of...art....it is very inspiring to think that one can do the same, following an almost identical formula (albeit with your own twists, we are indeed 'only human' after all)

yuyoyuppe
yazuki
effe
Fall Out Boy
Coheed and Cambria
At the Drive-In
Skrillex
fun. / The Format
Das Racist
Lamb of God
Mars Volta
Queens of the Stone Age