I use a fisheye lens all the time at weddings, lots of examples on my blog if you search them out...

http://crismatthews.com/blog/

It's not really that specialised, and lenses can be picked up pretty cheap if you look. I started with an 8mm Peleng when I had a cropped sensor camera, but I now have the Canon 15mm as it better for professional pictures.

What are you using to edit your pictures ??? Lightroom is the way to go if you haven't already.

Cheers

Cris