Your plugin looks great!
We are using the SQLite integration plugin to run a small internal blog site behind a firewall in a corporate environment. Most stats plugins don't work at all because they are not self-contained.
We hold great hope for WP Power Stats for our site, but so far it logs only page visits, browser split and platform. No visitor count (so no chart), and only 1 top link - no posts.
Would you be aware of any limitations using SQLite instead of MySQL that could affect WP Power Stats ability to log visitor counts?
And when is the likely release of v2.0?