Web 2.0 Level of Knowledge

I hope to learn a lot about Web 2.0 technologies. Some of them I am familiar with, such as blogs, wikis, social networking, podcasts. Others I don't have a clue, such as drupal, cloud computing, mashups. I have used some of the technologies. I have a personal facebook page and one for my library. I did one podcasts several years ago with a high school class. I love all the new Google Apps and use a lot of them and share them with technical students.