"WAL provides more concurrency as readers do not block writers and a writer does not block readers."<p>Excellent! This is the one feature that I missed before.
This <i>FLOSS Weekly</i> podcast of SQLite maybe of interest: <a href="http://www.twit.tv/floss26" rel="nofollow">http://www.twit.tv/floss26</a><p>Its from early 2008 but I found the discussion on <i>public domain</i> fascinating.