Windows 7 has new features to make images and text look better, especially on LCD monitors.
Are roses red and violets blue on your computer screen? If not, Display Color Calibration can help make sure colors are represented accurately. The new ClearType Tuner can make text look crisper.
Finally, Windows 7 makes it easier to connect laptops to external projectors, handy for giving presentations or watching movies. Just press the Windows logo key+P to toggle between your laptop screen and an external display.