• Hopefully stop crashing so often!
• Add the GStreamer command line options
• Fix the Invalid Encoder dialogue which wasn't going away
• Use the correct SI units when talking about file sizes
• Fix the path to the really, really cool orange icon
• Disable the Extract button when there are no tracks to extract
• Clamp the progress bar value, fixing a warning
• Display error dialogues if we can't create a file
• Fix up the "error" signal declaration in SjExtractor
• Stop depending on all of the GStreamer libraries

Basically, if 0.5.6 crashed for you, try this. I've nailed a few bugs which were causing frequent crashes.