Einsten's Dream - Strangely produces a clarity of mind. I've used it while working at the computer a few times.
Mostly relaxing - Spirit Journey I've played it through real player nebula screen felt like a daydream 
Mostly I like the music - you can listen to it but it does take you to a state where listening to it while driving is not the smartest do. Helps you to let go of the rushed feeling.
2 others I have, I have not managed to listen to them at the computer - they seem to take my focus right away from being able to concentrate on what I am doing; Higher and Protraits. They seem to cause a different type of focus; even more inward reflective music.
In anycase I only bought them for the enjoyment of the music. I suggest you listen to the sound bites on the hemisync site.
Alex
