About a month ago I was augmenting a client site with some added functionality that, while technically out of scope, I was able to add quickly thanks to a plugin. For whatever reason on this particular instance, I was really struck by how much value I was able to add to a client site thanks

More at: http://weblogtoolscollection.com/archives/2010/02/23/wordpress-plugin-developer-day-march-1st/