re: 2-color layouts Would depend on your preference of which colors to use, but 2-color variations shouldn't be a problem. If selected as a winner, you would be provided with all necessary color variations, based on your needs.
All of your entries are exciting. I like the use of negative space in #78 and #79.
I like #77 a lot. I was hoping to find a single logo to add next to the SONONACO name and could also be recognizable without the text. You can use other colors if you want; we would like to see some other color combinations
I was hoping to get some entries that reflect the legal name of the company ("Some No-Name Company Inc.") I thought it may be fun.
We have unfortunately been extremely busy these last few days with a big Zend Framework project and two WordPress(s) blog installations. ((s) being "secure").