You've seen that by removing dependency on a database, QuerySim can speed application development time and even have a positive effect on database development. You also saw examples of QuerySim being used in a live application for cached queries, form reuse and log viewing. Along the way we discussed the advantages of database abstraction and you learned how to use the PEAR DB QuerySim driver.
Hopefully, I've given you some new ideas and enough practical examples for you to see some immediate benefits. See if you can come up with a new way to use PHP QuerySim, and let everyone know on the PHP Fusebox mailing list.
Give QuerySim a try on your next project, it's one case where procrastination can be a good thing.
A sample application of the above is available here.