Tooble for Mac works fine...when it works, but it failed to download some videos in our tests. Those that do download play back well, making the program somewhat helpful.
Tooble for Mac's main menu seems rather cluttered, with a number of links on the side of the window and a main window containing a list of returned videos from YouTube. The menu also lacks pictures for buttons, or any user tutorial. However, the menu is fairly easy to use despite these shortcomings. Users can enter a URL for a YouTube video, or enter a search term in a bar in the upper-right of the window. After initiating a search, the results take a while to load, which is a disappointment. The returned list is also not as extensive as that on YouTube's site. Users can select a checkbox next to individual videos to designate them for downloading. Unfortunately, several of the videos selected for testing failed to download and returned an error message. Those that did work played back well from the test computer.
Tooble for Mac works half of the time. The application performs adequately when downloading some videos, while some videos fail to download properly. If you can live with this, then perhaps you can give this app a shot.