This is an audio discussion at EdTechTalk, discussing many online collaboration and education tools, including:

• What is a web server
• How do you work with/on a server
• Server software
• Moodle (education platform)
• Elgg (social network platform)
• Blogging software
• What is RSS
• What is podcasting
• Skype and other VOIP tools

It has an education angle, but it more broadly useful. A little old now, but a nice, intro for people new to these ideas. http://www.edtechtalk.com/EdTechTalk7