By hack I mean that it does not use a supported API in the iPhone system to do what it does. Individual applications have to be written to specifically use the system. If an application was not written specifically to use their OpenClip system then you can’t copy/paste from it and since Apple is not going to modify their own programs to work with it, it will never work with Mail or Safari.
Right now it only works with eleven different applications according to the developer, which is not a very large selection of applications to use it with. (Magicpad is based on OpenClip, and you actually can’t copy/paste between any of those applications with the 2.1 update)
And the developer’s blog even says that the 2.1 update broke the software so that you can’t copy/paste between different applications, only the same application (Magicpad) which seems kind of pointless to me, personally.
To learn how it actually works and why I call it a hack you may want to read this.
So again, I will personally just wait for full system-wide copy/paste from Apple, on my iPhone at least. But, as a proof of concept it’s not bad at the moment. I just don’t see it as anything more than that right now and only a solution from Apple is actually going to work well.