It would be nice to test phone with single webpage with heavy flash content (browserd sometimes goes nuts and hits high cpu even its minimized) and play music same time. That would be ultimate test how responsive phone is when it rings. I think that everything should go almost sleep when phone rings. In my opinion it should be priority number one.

It happens once in awhile to mee also. I have to wait couple of rings before i can answer and this is after using phone quite heavily. Others who are having this issue i would suggest that setting turning control to automatic takes away need of rotation when you are using phone in landscape mode so you miss one ring less.