Once I buy an app, do I have to re buy it if I uninstall it and want to use it again?
A gun in the hand is better than a cop on the phone.
Only the Skilled Survive
A computer lets you make more mistakes faster than any invention in human history - with the possible exceptions of handguns and tequila.
Drill Sergeant Frick's Rules For Un-armed Combat.
1. Never be unarmed.
2. See Rule #1
USMC rule # 23 of gunfighting: Be polite, be professional, but have a plan to kill everyone you meet.
Once you buy an app, you'll be able to re-download it as many times as your heart desires.
In the beginning when the Droid came out, I was damn near hard resetting my phone once a day to deal with the sluggishness that came from the loads of apps I was playing with...and not once was it an issue to re-download an app I had paid for.
P.S. Yes, this also implies I had to reactivate the phone each time I hard reset it...which was nothing more than a 3 minute automated phone call. Don't be scarred to reset your phone people. It's not like you have a limited number of reactivations nor do you have to speak to a human to get it done.