Uploading from your desktop straight to Instagram isn’t really anything new. There are a number of methods out there to let you access your Instagam account and post new images straight from Windows or OSX. Usually, they’re a bit of a long winded process.
The new LR/Instagram plugin for Lightroom, however, makes the process simple and smooth. Best of all, it’s completely free to try it out, and only $10 to register if you like it.