I had the same thing happen to me today...couldn't open it after restarting, couldn't open it after installing the updated sneaky peak (that's what I'm running).

Thanks for posting this! I removed the file and it opened right up for me as well. I sync with my iPhone, but don't have any other copy installed.



Info:
Build details:

Product: OmniFocus-1.1
Tag:
Date: 2008-08-26 16:12:01 -0700
Builder: omnibuild
Host: tb104i.private.omnigroup.com
Revision: 104362