I've retired from doing weddings now, but I used to shoot the aisle shots with a 24-70mm F2.8 lens on a D700. I shot from the front as they were walking towards me and used continuous focussing with burst mode. Always hand held and I never used flash.
I liked to to shoot wide to get in the guests, and I always shot landscape orientation, that's my preference and part of the style I liked.
Using a zoom suited me because I liked to get as many shots as possible at that time to make sure I got some great expressions, I'm a bit of a klutz, and if I'd used a prime and tried to walk back and forth, Im sure I would have knocked something or someone over.
Also, I always had a second body, usually a D300 with 85mm f1.8 lens round my neck, and if possible once the bride and dad went past me, I would swivel round and try to get a shot of the groom (between the heads of the bride/dad), seeing his bride for the first time.
One final point, I always told the the bride, dad and groom not to look at the camera but to smile and laugh at their guests when walking down the aisle, otherwise it would end up looking cheesy!
Here's about a dozen examples of my aisle shots:-
http://jalbum.net/a/1222546/
Cheers,
Bernie
www.raffephotography.co.uk