When a Linux users wants to get rid of a crashed program, he kills it - literally. The kill command is used for this purpose, but it needs the program ID (PID) number to work. This can be discovered using the pgrep.
With some types of CPU it's possible to manually alter the clock speed while the system is running. This can be very useful with a notebook computer, for example, where you might choose to throttle-down the CPU speed when on battery power to save juice, or to minimize heat generation when the computer is resting on your lap.
Some apps have a "fullscreen" mode that will cause the title bar, GNOME menus and GNOME panel to temporarily disappear. This can be useful for maximizing screen real estate, or just working without backgrounddistractions. If the option is available it will show-up on the View menu.
This is an oldie but worth mentioning in case you don't know. To kill the GUI, for whatever reason, such as a crash, hit Ctrl + Alt + Backspace. There's no warning dialog boxes when you do this - any open applications will be terminated, and data lost. You'll be returned to the GNOME
login screen, where you can login afresh.
Both the color scheme and font of GNOME Terminal can be tweaked. This can be a good way of improving legibility and also the amount of space GNOME Terminal hogs on-screen, because a smaller font size makes the window smaller too.
I've nothing against a blinking cursor myself but some find it distracting. To stop Ubuntu's block blinking, open gconf-editor and navigate to /desktop/gnome/interface and remove the check from cursor_blink. The log out and back in again. Note that Evolution appears to ignore this setting, but most other applications will now have a still cursor.
If you have an external monitor or projector that you occasionally attach to a notebook computer, you might be used to switching resolutions on a regular basis. Unlike with Windows, this isn't just a right-click procedure - you must navigate the System → Preferences menu.
When using Windows, you might have come across Device Manager, the handy tool that lists your PC's hardware. Ubuntu offers a similar piece of software, but it isn't installed by default.
In our world of high-speed broadband connections, we sometimes forget that a sizable minority of people use telephone dial-up to connect to an ISP.