Great, and works without a flaw.
It displays the specified flag in the title, or the default flag from the plugin's settings when a specific flag is not given.
Note that it is a content plugin, which means that for listings where the content is not searched (for example, the more... links on the front page) the flag is not shown. This, however, is not a problem for me.
I was looking for something like this, because some content items are in Dutch instead of English on my site.
Only comment: the documentation could be more extensive. I looked in the code to find the right yntax to display a flag.
Owner's reply:
Thanks for the excellent review. I've released a new version with a rewritten documentation which I hope is a bit easier to follow. I also blatantly stole your description of the plugin, hope that's OK.