From Techmonkey:
ASUS Taiwan is rolling out an SSD upgrade program for it’s Eee PC 901 lineup with the SSD drives.
Taiwanese owners of an Eee PC 901 SSD model can pay $1500 TWD ($43) and have their SSD drive upgraded to the next highest capacity. Apparently it seems to work like this: 4GB -> 16GB, or 12GB -> 24GB, or 16GB -> 32GB. They’ll have to take it to a local ASUS service center to carry this out. The 3G WWAN model is excluded from this offer. No word is this is going to occur elsewhere.