Venue: grandparent's backyard. Had that not been available a local church's community center would have worked (usually free or "free" with a donation of like $500).
Food: simple catered food. The wedding had a picnic theme (summer wedding) so we went w/ sliders and other finger foods. $8/head
Chairs and tables: Rented, but set up ourselves.
Photographer: Flew in someone from out of state. Much cheaper than a local LA photographer.
Dance Floor: Rented ($800) DJ: iPod with a playlist
Decorations: made our own decorations, borrowed strands of lights, etc.
It was a great wedding, wasn't terribly expensive and had a lot of guests.