Here are what my picks would be, if I had a vote, for the 2008 Grammy Awards. I haven't included all the categories (110?!? WTF.) I've left out those for which I've heard few if any of the nominees (i.e. Best Metal Performance), or about which I don't care (i.e. Best Jazz Instrumental Solo).
Record of the Year: "Umbrella," Rihanna feat. Jay-Z (although "Irreplaceable" is a close second for personal reasons:))
Album of the Year: Not voting, haven't heard three of the nominees. But as of now I would vote for Amy Winehouse's "Back to Black."
Song of the Year: "Umbrella"
Best New Artist: Feist
Best Female Pop Vocal Performance: "1234," Feist
Best Male Pop Vocal Performance: "What Goes Around...Comes Around," Justin Timberlake
Best Pop Performance by a Duo or Group w/ Vocals: "Window in the Skies," U2
Best Pop Collaboration w/ Vocals: "Give it To Me," Timbaland feat. Nelly Furtado and Justin Timberlake
Best Pop Vocal Album: "The Reminder," Feist
Best Electronic/Dance Album: "We Are Pilots," Shiny Toy Guns
Best Solo Rock Vocal Performance: "Radio Nowhere," Bruce Springsteen
Best Rock Performance by a Duo or Group w/ Vocals: "Instant Karma," U2
Best Rock Song: "Radio Nowhere"
Best Rock Album: "Magic," Bruce Springsteen
Best Alternative Music Album: "Neon Bible," Arcade Fire
Best Female R&B Vocal Performance: "No One," Alicia Keys
Best R&B Song: "No One"
Best Female Country Vocal Performance: "Before He Cheats," Carrie Underwood
Best Country Song: "Before He Cheats"
Best Score Soundtrack: "Pan's Labyrinth," Javier Navarrete
Best Compilation Soundtrack: "Once," Glen Hansard & Markete Irglova
Best Song Written for a Motion Picture: "Guaranteed" (from "Into the Wild"), Eddie Vedder
Producer of the Year: Timbaland
Best Short Form Music Video: "1234"
Best Long Form Music Video: "Trapped in the Closet Chapters 13-22," R. Kelly