I'm considering converting one of my products over completely to SQLite3. The management utility would be the only thing accessing the database, and accommodations have already been written to allow remote processes to obtain data without having to access the database directly. Also the intended setup of the manager will be behind a protected folder, so the SQLite file should also be protected in the same location. My only concern is... what % of hosting providers have compiled PHP with SQLite3 support vs MySQL 5+
Well, SQLite 2 is a default enabled extension in PHP 5.0 - Any reason you can't use version 2? Version 3 is supported as of PHP 5.1 through PDO. I would assume alot of hosts have already moved to PHP 5.1