[Jamie]

I agree with what has been said. Wood glue. I use a needle and syringe to get the glue down in the cracks. Don't be afraid of overloading it. The excess will squeeze out and can be wiped off with a damp paper towel.

I would not remove the bottom from the cabinet. First, clean any loose wood chips out of the cracks. Then I would add wood glue, then put some parchment paper against the bottom, then something hard and flat (I use a piece of 15"x15"x2" marble tile that I got from Lowes for $9), then use two or three clamps and make it very tight. Let it dry overnight. The parchment paper will keep the excess glue from adhering to your hard surface.

Are you planning on refinishing the cabinet, or are you more interested in saving the original finish?