An Austin, Texas based startup. They had a cool backend system built for managing the registration and organization of sporting events (think bike races). What they needed for an Austin startup bash was a marketing website, for the collection of potential leads and to show the world what their brand was all about.
We went Wordpress on this one. This was really just a simple brochure website and they had elements of a design, but not a design per se. We rolled our sleeves up and worked together with their CTO, who really spoke the language by the way, and had them a rather hot Wordpress site up and running within a week. Luckily their target market was primarily the audience that would be on standards compliant browsers, so that allowed to go from prototype to open for business in a very tight time frame.
There was a LOT of CSS3 on this site. The Nav menu alone took the better part of a day, just getting the drop shadows, the corner radiuses and the background gradients feeling right. This was the first site we built where we had full permission to run wild with CSS3, so we went with it.
The day before launch we were introduced to CSS3PIE, which is a cool little library that some good samaritan out there whipped up to backport CSS3 features to Microsoft browsers (even IE6). We were about 3 CSS rules into trying to do something for the IE crowd when we dropped it in there, and low and behold, after a little bit of futzing, it worked splendidly.
A wee bit of the jQuery Fancybox on the main product page and we turned it loose on the world.