I have been having trouble accessing blackberry.com from my device, and also app world (the webstore on PC) is not functioning correctly when you try to send yourself a link to an app. And also from AppWorld on my Storm when i try to download yahoo messenger, it gives the error: "This application is not available for download from Appworld"
I tried purchasing an app from App World earlier, and kept receiving a Paypal error. Contacted Paypal, and they said they had no record of the error and it was probably a connectivity issue on RIM's end.