I put one in my laptop yesterday. I got a 250g drive for around $420. It has sped things up considerably. Not the "instantaneous" load time I was expecting (based on what a friend had told me), but it has considerably increased the performance of my laptop. I am running an intel i7 w/ 8gb ram and the ssd drive.
The server has a slightly faster response time (just under half a second on the entire web page load time), not very noticeable going from 15k RAID 10 to SSD, but I have a lot of headroom on my web server. I suspect that the IO speed difference would be more noticeable if I was getting 2x-3x as much traffic as I am getting on it right now. It handles roughly 12k unique visitors per day at the present time, but has been growing steadily.
So far, so good.