So, I just listened to the 3 tracks I mentioned downloading previously.  Maybe I'm easy to please, but I liked them all.  The Goo Goo Dolls song, "Before it's too Late," has a nice feel to it being Sam & Mikaela's love theme.  I imagine it will be played during the final scene in the movie or the credits.  Regardless, it's a good song.

Linkin Park's "What I've Done" is from their "Minutes to Midnight" album, so if you have that already, which I don't since I've long burned out on their music (my own fault for listening to their albums as much as I did), you'll know how this goes.  It's typical Linkin Park fare and not something that's been played to death on the radio (yet), so I'm enjoying it so far.

MuteMath's "Transformers Theme" isn't what I was expecting.  I don't know what I was expecting, since I'm not familiar with their work, but this wasn't it.  That may sound negative, but I mean that in a positive way.  It rocks and is a pleasant spin on the original Transformers theme.  If this is indicitive of the rst of their work, I may have to look into getting more of their music.