One thing wordpress lacks is a stock picture plugin.
As a photographer I see that stock libraries are eroding the value of photographs (not the amatures of the clients buying the images).
The only way to fix it is to stop supplying the stock libraries with images and self-host now that online diskspace is v.cheap.
There's a basic plugin for Joomla (called Picsell) that will work, but it would be great if there was a plugin to do this within WordPress rather than having an install of Joomla alongside WP.
I'd pay (once) to have this functionality for sure.