The SSD Revolution Begins Now
I think that at this moment in time, solid state drives are about to cross over from the bleeding edge and become more mainstream. They have reached the point that you can have a really usable capacity at a reasonable price point- a decent 120GB SSD can now be bought for under $275.
In addition, some manufacturers such as Apple and Lenovo (Thinkpad) are now including SSDs as configuration options. With benefits of lower power consumption, blazingly faster seek times, and better reliability, I personally am likely to include an SSD in my next notebook computer purchase. I have had too many hard drive reliability problems in the past, and am happy to switch.
Some links to get you thinking about this interesting option:
Putting 2 SSDs in a Macbook Pro for RAID 0 - the performance from a notebook is incredible
A Six Pack of SSDs Compared - from The Tech Report