I been seening ajax all over the place.
The only time I have used is in the news feeds script
I got from dynamic drive.

The first question I have, is do you need to have
a database dns sort of thing to be able to begin
learning it.

Where can I find simple ajax code to hack around on.
I learn more about syntax and sub routines. By experimenting.

So if i could start on something simple. Let me know.
I know some css javascript and a tad of xml.

A great tutorial on AJAX can be found at Google here
AJAX doesn't involve databases - its more of a way to display data that's already been retrieved from a server (which may, then, involve database access).