"bleeding edge" or not you should be wary of downloading Mobility drivers from ATi. 90% of ATi's installed on laptops have manufacturer specific drivers. Toshiba is no exception. However having said that it is unlikely Toshiba will be breaking any records to produce Vista drivers for their older laptops when they have only just got drivers out for half a dozen of their current models!
The generic Vista ATi Mobility driver should get you running but at best you will only be able to get 1024x768.
If you want better graphics you need to go back to XP at the moment and be patient (with a real risk that you may never see an official release for the S6053) Remember all the problems about finding XP drivers for older kit? Well it's about to start again
