Feel free to ask any questions that come up. I'm a long-time Ubuntu user (since the 8.04 release), and am also in the process of migrating from 10.04 (with GNOME desktop) to 12.04 (with KDE).
Unsolicited Tip #1: For web browsing, install either Chromium (from the repository) or Chrome (from the Google site). Main difference between the two is that the Google Chrome version has Flash and PDF integrated into the browser, while the Chromium version does not (Flash requires a plugin, and PDFs open in a separate window instead of in-browser).
Unsolicited Tip #2: Install the dwww package. Gives you access to hyperlinked documentation for all packages currently installed on the system, via a browser based interface (just open localhost/dwww in your browser).
If the world isn't making sense to you, you're either drinking too much or not drinking enough.