Have you looked at the Jeffrey Friedl plug-ins? http://regex.info/blog/lightroom-goodies
I have been experimenting with the Picasa plug-in for the Lightroom 4 beta and it is very sophisticated. And, it works flawlessly.
I don't know exactly what you are looking to do with your web management, but I suspect Jeffrey has something that will work for you. He's developed a prodigious number of tools.