Bruno Zambetti post a tutorial on devX.com site in which he shows how to start using the Google Maps(GM) service on your web-pages. Here' the short tables of contents of this tutorial:

• Understanding Google Maps Technology

• Coordinates

• Getting Starting with GM

• Working with Markers

• Working with Lines

• Working with polygons

• Creating GM Files Programmatically

• Geocoding

You can read the full version of this tutorial on devX.com