I have not completely abandoned it. I simply have not had the time to work on it. It was originally developer as part of a project for work, but I no longer work on that project and so the time I can devote to this plugin is very limited.
Thank you for the feedback though. The fact that some people really like it, and it seems to be the most popular plugin of its kind – at the very least lets me know that its worth investing time into. I also believe it may have driven a small amount of inspiration for core, when they paid attention to the media library in 3.6.
I fully intend on giving this plugin some attention, but at this point I simply can not guarantee any sort of time frames. Thanks again.
