I bought my MBP in September (five months ago) and this problem appeared about two months ago. It progressively got worse, until I was unable to draw in Photoshop, drag windows around, or resize stuff. What a pain. And pretty disappointing for a brand-spankin-new Apple laptop. After the quarter ended and I could be without it for a while, I had a genius look at my laptop. As you might have guessed, the entire trackpad assembly was to be replaced. It was a $135 affair, but covered by warranty. The new trackpad works great (three days post repair now), and I really love the laptop.
Down is the most common way to scroll the mouse, so it gets much dirtier than the other directions. I've seen this problem with many Mighty Mice, and the solution is simple: Use rubbing alcohol to clean the scroll ball. Dab some on with your finger, or perhaps use a paper towel. Roll the ball around for a while to get the alcohol spread around, and then dab it off. Repeat a few times, until the mouse is scrolling correctly. Don't drown the thing, but be somewhat generous.
Are you using the device more? 10 hours does seem pretty quick, but I've never had an iPhone that could last more than about 36 with any real usage. Did the decrease correlate with the update to OS 3? Did you re-pwn the firmware for the upgrade, or just auto-update in iTunes? I've seen some weird things happening with jailbroken 3.0; if you built your own, you might want to consider reinstalling it.
Location services is a huge battery hog. Try turning it off (Settings > General) for a couple days and look for improvement. Do you have Bluetooth on? It shouldn't be the problem, but might as well check. Is your phone jailbroken or unlocked? Those may also make a difference.
Do you have pictures of the dings? The color is most likely under the clear epoxy, so surface repairs shouldn't damage the color directly. Repaired spots will probably be "foggy." You can fix this by sanding the spots with fine-grit sandpaper and then wiping with board wax.