I’m giving a presentation on what everyone is missing out on the web to my group at work on Wednesday. 90% of the people that are going to be there have never heard of Firefox, don’t know what Gmail is and certainly don’t know what RSS is. I’ve got a load of topics I will be talking about in detail, however I’d like to ask everyone reading this what they believe are the most important contributions, sites, applications, technologies that have been released on or related to the the internet in the past 5 years.

Currently I’ve got the following headings I’m playing around with:

1. Brief History of the Internet - It's only a little over 10 years old, where was it and how has it matured?
2. The Open Source Movement - Brief explanation and introduction to the plethora of programmes out there ripe for use and contribution towards.
3. Firefox - The only browser you should be using.
4. Google - What it can do for you that you didn't know
5. The Wireless Office - "Web 2.0" applications, Writely, 37Signals, etc.
6. Emerging Technologies - RSS, Tagging.

What do you think I’m missing, bearing in mind I’ve got only 50 minutes to play around with and I’ve got to condense everything in roughly 40minutes with 10 minutes for questions.