While these are still too expensive for the average budget the race is on. I expect in the next few years we will see dropping prices and increased capacity. Although I do not expect that flash drives will match the cost per megabyte of magnetic storage at some point in the very near future the price/performance curve will make flash based HD a very attractive alternative for laptop hard drives. The SanDisk drive mentioned in the article is already at the right capacity for most corporate notebooks.
AppleInsider | Intel introduces first solid-state drives based on flash memory
Conceived as a drop-in replacement for other notebook drives, the “SATA 5000” fits into a standard 2.5-inch space without any changes but consumes less than half the power. The 32GB drive will run system builders about $350.