Top apps not installed on Ubuntu by default

There are hundreds if not thousands of these "Top 10 linux apps" and "Apps you must have following Ubuntu installation" type blog entries but in my opinion these are useless unless you can identify with the author. To help you identify with me:

• Been using Ubuntu for home use (DVDs, photos, internet) for over 5 years.
• Mainly use open source applications but not exclusively.
• Prefer to pay nothing for the software.
• It should just work "out the box", no command line or extensive "how to" required.
• Could be said I am a Google fan boy