Thanks for highlighting my laziness Tom, I tried to intimate that I was speaking about 'Android' by using an apostrophe before the truncated word...
Isn't the D-HD based on the same underlying architecture as the standard Desire? D-Z is out based on the slide-out QWERTY.
It's more to do with work than anything and we already have an abundance of iOS in our studio and I fancied a change!
Browser-based Flash is not something we're going to get away from any time soon and well-written and sensibly-optimised Flash/ AIR apps can run very well under iOS/ Android! IMO, it's also good news that Apple have revised their stance on Flash-based app development (Source).
May wait until later in the month to trial a WP7 device. Shame the launch handsets (I've seen) look like they were designed by a child...