My provider's database server recently had some downtime and my site was displaying the classic "Error establishing a database connection" message for about an hour.
I knew what the problem was but realised it would be useful if I was able to replace that message with something a little friendlier (ideally a more verbose message contained within my site's template, so as not to scare users).
My question is: are there any plugins that provide this functionality? Or does this error occur at too low a level for any plugins to be invoked? If so, I'll probably edit the WP core, but it would be nice to use something more pluggable.