Minitube is a native YouTube client for Linux (as well as Windows and Mac OS X) which you can use to watch videos without Flash Player. Further more, Minitube can also be used to download videos from YouTube.
Minitube 1.4 was released today, the new release finally bringing YouTube channels support:
Being able to watch YouTube channel in Minitube brings a whole new depth to the application. Discovering channels is easy thanks to the autocomplete popup, which suggests the most relevant channels for a given keyword.
The new version also fixes a lot of playback problems (Minitube now tries to find a fast stream and discard slow ones) and also comes with a small Linux command line feature: you can now launch an YouTube video from the command line using Minitube (you can specify a keyword or an URL).
Install Minitube 1.4 in Ubuntu form the WebUpd8 PPA
As usual, the latest Minitube 1.4 is available in the WebUpd8 PPA. Please note that I've only tested it in Maverick!
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install minitube