Iíve been searching for the same thing. Since I spend a lot of time in the car, I need a system that leaves the phone facing me. This excludes most of the holsters currently available as they all fit the 8900 with the keyboard facing in.
I have an old mount from a Sony Ericsson cradle. The base works very well. So, what I have been doing for the last several phones is to bond a new phone-specific holster to this mount.
To keep this short, I have been searching for a plastic holster for the 8900 to maintain this scheme. But alas, there are none available yet.
I did find this on eBay and bought it. (It works with a holsters belt-clip.) Since it is not phone specific, it should serve me well through the next several phones. For now, Iíll couple it with the Speck leather holster for the 8900.
FYI - The magnet inside the holster will need to be removed to prevent the 8900 from going into sleep mode. Thatís easy enough to do though
My setup with my old 8120:
(Note: The beige leather base is from www.kudausa
. They make them for a variety of vehicles.)