I'm using the fabulous codestyling localization plugin for the po mo stuff and I get the following notice for your domain mapping plugin:
Compatibility: Loading Issue: Author is using load_textdomain instead of load_plugin_textdomain function. This may break behavior of WordPress, because some filters and actions won't be executed anymore. Please contact the Author about that.
There are no problems but I thought I might just post it here. Your themes seem to be using the load_plugin_textdomain function and there's no warning for the themes.