I am using an IBM compactflash 1gig microdrive and speed is great... the BEST part is that they are so much less expensive than the 'stick', although I have a 256 'Pro' as a backup.
also:
I am NOT affiliated with THIS company, but have recently bought 3 NP-FM50 batteries from them (around 11.00/ea) and they have proven to be EXEPTIONAL... avg time 2.5 - 3 hrs/per and the camera has no problem recognizing the Info-Lithium status... see www.power101.com