The Buzz has a great cell phone / iPod pocket which appears to be sewn into the strap.
I have the Brain Bag and love it, but I would REALLY like to have a similar pocket that I could attach to the shoulder strap of my Brain Bag.
Ideally, I'd like it to be big enough to accomodate an FRS/GMRS two-way radio (approx 2.5" x 1.5" x 5") but leave the antenna sticking out. That would give me the flexibility to carry my radio, a phone, an MP3 player, or even a small pocket camera... depending on what I was planning to do. The pocket could be slightly smaller if it were made of neoprene so that it could stretch a little.
I've been looking all over for such an accessory. There are a few options that work for a small cell phone, but very few choices which are big enough for the radio.
Maybe you would need a small and large size.
Most of the pouches available now are made to attach to a belt. That doesn't help much when you need to put it on a backpack or shoulder strap.