I have traded my work iPhone for a Samsung Focus running Windows 7. Since I will more than likely be developing against Microsoft's system, it made sense to change them out, even though I really, really like the iPhone and actually own and use one personally.
I'll be writing a blog post about first impressions and my thoughts on my new phone, as well as what I think about the differences between the two in a later post. For now let's just say that it is going to take some getting used to.
Have a good evening!