You can now drag and drop the corners of most screens, such as the videos to enlarge them. Depending on your computer setting, the image quality on the new videos should be fine if you double the size -- beyond that they may get fuzzy on some computers.
The ability to look at many birds and jump between them is a feature that is in v3.9 as well as the Gold edition. Just click "Windows" in the Menu bar. You can add as many tabs as you like and then select a different bird for each tab. This feature was added in July 2007. (If all else fails, read the instructions)
Actually, we spent a LOT of time rewriting the Help Manual for v3.9.6 and the Gold edition. Things are now easier to find.
The secondary view in Photo Gallery and the new maps in the Gold version are big inprovements, I think. But my favorite addition in the Gold version is the ability to import your own media and the ability to make quizzes on foreign birds, butterflies or anything else!