||Top Ten Digital Photography Tips|
Response to: wedding pictures
I also use the XTi, I've used it on the "P" setting using an external flash. Make sure you have the "WB" set to flash plus have the quality rating set to the best= menu>quality>L.
I also have my Flash Exposure Compensate at +1, you may not need to do that. It's located in menu>camera2>FEC.
It's also a good idea to attend the rehearsal at the church and just take shots. That will help you find out what works best.
Good Luck, PB