It's a day of mixed blessings if you're a Windows Phone developer. The upside? Microsoft has shelved its old App Hub in favor of the heavily reworked Windows Phone Dev Center: along with being simpler and more reliable, it now lets app designers offer their apps in four times as many countries (three times as many for paid apps), gives them better tracking tools and lets them at last get payment from Microsoft through PayPal. We hope they aren't making too many grand plans to bring Microsoft's newly added