Fruit + Wheat beers have become one of my favorite styles. I either use extract or frozen fruit and have done raspberry, strawberry, and cranberry.
When using extract I'll add the flavoring at kegging time. When using frozen fruit I let fermentation complete in primary then transfer the beer onto the fruit and give it about a week to pickup flavor before kegging.
With the raspberry and cranberry batches, sometimes it comes out a bit tart. I had one that was almost undrinkable, but I gave it a few months to mellow and it turned into one of my best brews.