WP/LR Sync is a Lightroom Publish Service for WordPress. It helps you to publish / export your photos and collections to WordPress and to keep them synchronized. Any changes on your photos (including your metadata) or your collections will trigger a re-publish. Your website will be always in sync with your Lightroom.
This plugin will be extremely useful if you:
Basically, WP/LR Sync is an important tool for photographers or bloggers using a lot of photos in their articles.
WP/LR Sync is a bundle of two plugins. One is available on the WordPress repository and has to be installed on your WordPress website. The other one is for Lightroom and can be downloaded from here (sidebar on the right). The two plugins will communicate and keep everything synchronized.
You might have galleries, albums (or something similar) on you WordPress. This is not a core feature of WordPress, it is brought by specific plugins (Photo Gallery, NextGEN, etc…) or themes. They create those for you but they all work in different ways.
So how can WP/LR Sync make the collections available to those plugins and themes? It is done through WP/LR Extensions. Extensions are free little plugins that add support for those gallery plugins and themes. For example: are you using the Tripod theme from CosmoThemes? Install the WP/LR Sync extension for CosmoThemes. Then your Lightroom will magically be synchronized with the galleries in your theme.
This system is clean and powerful. As these data are stored internally by WP/LR Sync, you can even switch between plugins and themes and your collections will always follow you. You are not forced to use a specific gallery plugin or theme forever.
WP/LR Sync has plenty of features to please its geekiest users (and I am one of them). In LR, you will find two interesting modules (in Library > Plug-in Extras).
Total Synchronization will link (then sync) the photos you have previously uploaded to your WordPress with your Lightroom. This special process uses image recognition and metadata to do the matching. You can learn more about it here.
Switch Photos lets you pick two photos on your Lightroom (one should be already uploaded on your WordPress, the other not) and will switch them. That’s the easiest way to replace a photo by another one on your website.
If you are curious to see what people and blogs say about the plugin, you can check those links. They can also help you understand what the plugin does.