Jasper van Nieuwenhuizen's new 'Pose Lib Preview' add-on will generate thumbnails for poses of your rigs, making it easy to quickly switch to the correct pose.
Some time ago Pratik Solanki made a request to add thumbnails for poses in a pose library. I responded to his request and quickly 'hacked' something together that worked fairly well. After that I've been adding and refining some things. Most important feature I'm working on right now is automatically adding thumbnails for poses. It's almost finished but I still have some work to do.
A demonstration of the addon can be seen here:
And a quick demonstration of automatically creating thumbnails (not finished yet):
Be warned that this addon is still very much in development and more a proof of concept then a polished addon for now. So expect some rough edges and bad code... :)
If you have any suggestions, bug or comments, feel free to let me know (preferably on Github).