If you get your Trim disabled by installing 10.7.3 update, just use Trim Enabler to re-enable. It works just fine in 10.7.3. Trim Enabler will patch your new kext. If you don’t lose support, then you are fine and you don’t need to do anything 🙂
Also, I discovered a “bug” with Trim Enabler 2.0, you can’t launch the app from the .DMG, if you do, nothing will happen when you use the slider. This is because Trim Enabler can’t get permissions from within the DMG. I will make so next version gives you a message to pull the app out of the DMG before you use it.