What's the most you've made on a single project?
The site I'm just finishing up on has ended up paying me a little over $20,000 ($3,000 of which went to my programmer) plus 10% ownership of the company
edit: This included complete design and construction (all XHTML/CSS), server set-up, project-management, creating the spec and coming up with a better name for the company than was initially decided upon.