Photo oganization help-Aperture--->Lightroom?

So I foolishly used Aperture to edit photos, and it took all my photos and put them in some insane Vault/Project system. I now use Lightroom. Anyway, everything is a mess. Is there an application or a tutorial or a method or something to get back into some sort of organization? My photos are spanned accross my computer and my external hard drive and I just am defeated from trying. I am on a Macbook Pro running 10.5.8.

Thanks