DevShed has started a small series today that seeks to guide you through the world of SQLite as is interfaced through PHP5.
If you use PHP 5 to build web-based applications that access a database, you might want to consider SQLite. A "lighter" option than MySQL, this database may still suit your purposes if you don't need all of MySQL's bells and whistles. This three-part series covers many of SQLite's most useful features.
Their post today, part one talks about the basics of the protocol and how to get started with it in PHP5. Since it's enabled by default, the chances of it being on your installation are great. They only really look at grabbing data from the database in this part, saving pushing data back in for another time.