An odd limit of unlocked Window Phones (even our sanctioned developed unlocked device) is the ability to side load more than 10 apps on the device--you simply can't do it. Reportedly, this was put into place to prevent developers from creating a ton of "cheap" apps.
One repercussion of this limit is it severely hampers the hombrew scene--after all if you're installing shortcuts to your WiFI, Bluetooth, Accent Changers, flashlights, a compass, etc. it doesn't take long to hit ten. Awhile back, Thomas Hounsell modified ChevronWP7 to disable this limit, but ChevronWP7 has it's own issues including being disabled in the future.
Now, (nico) over at XDA has created a program that goes on the device itself to remove this limit, making it a lot easier for developers to bypass the ten-app barrier. It works on Samsung, LG and HTC, though we're not sure abou Dell--so your mileage may vary. The good news is there is a rollback feature in case it doesn't work out. We know for our purpose on this site, bypassing this limit helps out tremendously.