The site will be built with this theme and will be using the same colors: 
http://wbpreview.com/previews/WB000C138/ 
 
I like the simple, understated logo in the theme preview above, and would like to use something like it for ZipPlease. 
 
The site is really about an API that developers will use for their sites and applications. Possible logo ideas to incorporate (use any or none, please be creative: 
- Curly brackets to represent the JSON API { } 
- Zip file (perhaps some kind of abstract representation) 
- Speed

Responded quickly to changes and was the most creative when it came to coming up with an icon to represent the brand. Great work!