Hello,
Here's a quick tip for improving your thumbnail/image quality. I made this change because the PIL default JPEG quality if not specified is 75 and I think it produces poor quality images in many cases, especially when there's text in the image such as podcast art.
Modify the following file:
/mediacore/mediacore-0.9.1/mediacore/lib/thumbnails.py
Change line 222 from:
thumb_img.save(path)
To (95 being your desired image quality):
thumb_img.save(path, quality=95)