this will hopefully help me later this year determine a best-of-2009 list. it's by no means comprehensive, and is assuredly missing something vital. feel free to mention additional things in the comments.

electronic, dance & pop:

• Bat for Lashes, Two Suns
• Beastie Boys, Paul's Boutique (remaster)
  
• Björk, Voltaïc
• Gil Mantera's Party Dream, Dreamscape
• KMFDM, Blitz
• J.G. Thirlwell, The Venture Bros.: The Music of JG Thirlwell
• Toy Selectah, The Mex-More EP

electronic, other:

• Atom™, Liedgut*
• Boxcutter, Arecibo Message
• Fever Ray, Fever Ray*
• Mochipet, "Master P on Atari"
• Phaeleh, Fire / Isolate
• Rusuden, Death By Din Sync
• Teef, "The Subsitute"
• Venetian Snares, Filth
• Joker, "Digidesign" / 2000F & J Kamata, "You Don't Know What Love Is"
  

rock & metal:

• Buried Inside, Spoils of Failure
• Maserati / Zombie, split e.p.
• Obscura, Cosmogenesis*
  
• Zu, Carboniferous

* These are definite contenders for top 10.

please note: specifically left off the list: the new MSTRKRFT.