Oh dear Windows Phone 7, looks like Microsoft really doesn't love you anymore. If you were on the fence about buying a new Windows Phone right now, this should tell you what you need to know. Microsoft's new in-app purchasing system will only be available on Windows Phone 8.
I won't lie, the Nokia Lumia 800 and 900 are really nice phones, and with the new start screen, they're going to be really solid devices, but I just can't recommend you buy one right now. Ballmer and co are essentially jettisoning Windows Phone 7, and with it all current Windows Phones.
I guess it's just one of those things. Let's hope Nokia's incoming Windows Phone 8 devices blow our socks off. [Microsoft]