You lucky dog. I imagine there's a better way, but the way I usually check for dead/stuck pixels is just to check the whole screen with white, then black. You can just flood-fill a new image in Windows paint and drag it around the screen, or set it to be the background, or whatever. I'm almost embarrassed to admit my low-tech ways around all the gurus on this site.
I'd enable "standby" when the lid closes, and close the lid whenever I'll be away from the computer for a few minutes. Aside from that, you can just try dimming your screen and disabling your Wi-fi device when you don't need it to enable longer battery life. If you're a power user running lots of applications and popping around a lot, then setting the normal caching/performance registry tweaks (DisableExecutivePaging, etc.) would probably help both speed and battery life.
I agree with what others have posted: you should really make sure you NEED to do it before you go discharging your batteries for maintenance purposes. You may not need it, it might actually damage the battery, and at the very least you'll be wasting some of the 500 or so charges that your battery'll be good for (at least that's the conventional wisdom; I've had batteries last much longer and still give decent performance).
Probably the hardest thing for me, personally, is not running off of battery all the time, even when I'm camped out on the couch and plugging in isn't difficult. I'm just really lazy. If you manage to only use the battery when you really NEED it, depending on circumstances you can easily double or triple your battery's useful life.
I'd probably spring for the modular battery now, unless you really don't have the money. In fact, I'd probably watch things carefully, and before the T42 ends its model run, I'd pick up an extra main battery just to make sure I'd be covered down the road.