TrimTheFat is a simple, silent drop-launch utility to strip the code for the architecture(s) you're not using from a Universal application. Please note the low version number. It's a work-in-progress being released so people have something in-hand and to encourage feedback.
What's new in TrimTheFat
Added an updateable "blacklist" to bypass the growing number of apps that refuse to run after detecting apparent tampering with the executable.