Add yours to the list!
Here's mine:
Rearrange the scene - if you're shooting nature and a flower or leaf is distracting, I use panty hose to anchor it down and away from my shot! lol This way it won't harm nature and I still get my shot.
Crop the composition - really look into your view finder to imagine the picture and space - if there is too much dead space, zoom in or move closer to fill the frame
Don't forget to set your white balance - especially in midday light! In midday you can get a much more detailed sight if you set the white balance to a cloudy setting - you'll trick your camera into thinking it's cloudy and will set it to a warmer exposure! ;-) (Someone on the other board shot a gorgeous red sky that lost the warmth, if they had done this, it would have been truer color exposure)
Invest in a great polarizer filter so you'll have better saturation and unwanted glare, as well as more dramatic shots
EXPERIMENT WITH VIEW POINTS! I look like a nut when i'm shooting, even when i'm shooting people! I get into the craziest positions - yoga helps with flexibility! lol
LOOK AT YOUR BACKGROUND! You are not only shooting a subject, but you have a background too - your background can destroy a great subject!
Oh - and don't forget to carry extra batteries and memory cards if you shoot digital! I learned this a few days ago when I went to shoot a house with a gorgeous sky behind and my camera died! OUCH!