The Massive 2 mb Shellcode API Hash List
So here is a Google spreadsheet link for anyone who would like a local copy. Just a warning the spreadsheet is 2 MB.
https://spreadsheets.google.com/spreadsheet/pub?key=0AsJdvp2NWuJDdHdiYmRUTzNJaHctZEVaZXZndjNCTlE&output=html

Malware Analysis Search to include a page for searching Windows API Hashes.
http://www.google.com/cse/home?cx=011750002002865445766:pc60zx1rliu