Also, got this off Wikipedia...confused me more!
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Memory Stick PRO
The Memory Stick PRO, introduced in 2003 as a joint effort between Sony and SanDisk [2], would be the longer-lasting solution to the space problem. Most devices that use the original Memory Stick form factor support both the original Memory Sticks and the PRO Sticks; some readers that were not compatible could be upgraded to Memory Stick PRO support via a Flash ROM update. Memory Stick PROs have a marginally higher transfer speed and a maximum theoretical capacity of 32 GB. High Speed Memory Stick PROs are available, and newer devices support this High Speed mode, allowing for faster file transfers.
All Memory Stick PROs larger than 1 GB support this High Speed mode, and High Speed Memory Stick Pros are backwards-compatible with devices that don't support the High Speed mode. High capacity memory sticks such as the 4 GB versions are expensive compared to other types of flash memory such as SD cards and CompactFlash
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Does that mean if I get a Pro Duo over 1Gb, then it will be High Speed compatible?
On a good note, I received a shipping confirmation from Musician's Friend. When I get home from the inlaws, I hope to find it (my new PCM-D50) on my door