Now the fun begins!!!

Let's see about this death to DLL hell...

Install the new framework and try your existing app. That might work, with the side by side versions and all.

Now, make a new version of your assembly referencing the latest versions of the framework. Then, send this assembly to a friend that hasn't installed SP1. Will that work???

The whole point of the framework (21MB download) is so you don't have to distribute it with each of your apps. But, now you will have to check versions of the framework if the SP1 patch fixes something that you need to use. Right?