[dishe]

snake0721, I think you're still misunderstanding how readyboost helps a PC.
Spinning hard drives are slower than solid state memory, especially when it comes to quick short bursts of access (the drive has to wait until the relevant info is under the spindle, the effect of which is a measurement of time called latency).
Solid State memory, such as SD cards, are not as fast access as RAM would be, however they don't suffer from the latency of a spinning disk. That is why solid-state computers without a hard drive like the Asus EEE PC can boot windows XP in under 10 seconds even though its got outdated specs (900Mhz celeron CPU and only 512MB of RAM).

The downside to having a fully solid-state computer is that the size of the storage is severely limited (The average EEE PC only has 4-8GB of storage). So, the most efficient solution is a combination of spinning disk drive for size, and a solid state chip for caching what doesn't need to be in RAM.

The reason this doesn't apply to our Windows Mobile devices is that there is no spinning disk drive! Our memory is ENTIRELY solid state!
Whatever speed benefits you get from avoiding the latency of a spinning HD don't apply here. The only way you'll load stuff faster from storage is if its already in RAM (since RAM is faster than the EPROM storage chips and SD cards), and since we have very limited RAM to begin with, the whole conversation is pointless. It won't go any faster even if you managed to cache to SD.

Hope this helps clear things up.