I still can't figure out how disable droids notification so I can get only handcents notification I go to settings but can't find it after that::::
Open the main pull-up screen that shows all your apps, settings and other options.
Select the default "Messaging" icon (it looks like a green box) to open the original messaging problem.
Now click on the physical button on the bottom of the phone that looks like a bunch of horizontal lines.
An option should pop-up that says "Settings".
After clicking the "Settings" option, scroll down the settings list until you see "Notifications". You simply click on this to uncheck the box beside it.
Thats it, you have disabled messaging for the default messaging program. Now handcent should be the only program that notifies you of messages.
Note: Some APPS can control settings on the phone. Some people have said that the "Locale" app prevented some vibration settings and such from doing what they set it to, because the Locale app controlled those settings (even if they went to the setting on the phone and changed it).
So if it still does not work after unchecking the option, another app could be forcing that particular setting.