Buffalo have announced an expansion board for the ASUS Eee which adds extra SSD-based storage. The board, which plugs into the Eee's mini PCI-Express slot, will be available in 32GB and 64GB capacities.
It's uncertain what effect adding the SSD will have on the Eee's warranty. Buffalo appear to be working with ASUS and offering their own warranty on the storage at least.
Buffalo are suggesting the board will be released in Japan this September, though there's no word on if or when it will spread outside of there. It's priced at around $156 for the SHD-EP9M32G 32GB model and $316 for the SHD-EP9M64G 64GB model.