Whenever I meet geeks for the first time, I tend to run through a list
of tools I think they should try out. Here's a partial list:

• *Blogs*: Not just for writing about what you had for lunch. Blogs
  

  are great for personal knowledge management (keep your own
  learning notebook). Run your own with WordPress or host it on
  WordPress.com, Blogger, or Schtuff.

• *Blog aggregator*: An absolute must if you read many blogs. I like Bloglines because of
  folders.
• *Wikis*: Excellent for quick notes and websites, particularly
  when people need to collaborate. Make one on Schtuff or
  set up your own with Pmwiki or Mediawiki.
• *Social bookmarking*: Not only is tagging a great way to organize your personal bookmarks, but
  you can discover interesting sites and people through social bookmarking. Most of the early adopters seem to be on del.icio.us, but I think Myweb 2.0 is more promising because it has better search. CiteULike is great for academics.

I've got more lists around here. For example, I go through a different set when talking to a Web 2.0 person…