The price of the Solid State Drives (SSDs) continue to fall which is pretty exciting IMO. SSDs and store bytes in chips that retain their state even when the power is turned off -- as opposed to RAM. They replace typical hard-drives which store bytes on rotating platters of magnetic material. SSD are more expensive now but are much faster, quieter, use less power, generate less heat, and should be much better in terms of reliability. Prices are all over the place but US$300-400 for a 128gb SSD seems to be about right while you can get 1tb SATA hard drive for US$100 -- making SSD ~20x more expensive.

Performance of these new drives is where it gets really exciting. I've not found a definitive performance study but 100x faster was often cited depending on random-access versus large read/write bandwidth access patterns. Since SSDs are silicon, we should be able to better tap into the silicon improvements. We have seen 10x speed increases of hard drives over the past 20 years while CPUs have increased 1000x. Here's a good article from Rich Coulson with Intel's SSD group.

It is obvious to me at least that within 5 years we will no longer have drives with spinning drives in our computers. Price performance will probably have dropped to 3-5x that of spinning hard drives and performance and density will probably have increased as well.