I definitely know Glassjaw. My old band actually covered a couple of their songs (maybe three, but I only remember two). Ry Ry's Song and Tip Your Bartender. I'm familiar with Minus the Bear too. A couple good friends of mine are obsessed. I enjoy them, but haven't listened to them much.
Reznor has posted the files he used to make the songs on a website, so I've downloaded those.. I load whatever files of those that I want to use in Fruity Loops and make the music. Then I export the file to reason and load better samples (strings and piano sounds are better in Reason, but it's easier to write in Fruity Loops). Then I mix with Adobe Audition.
It's complicated and difficult..