I'll throw my $.02 worth in:
As you're surfing the 'net and you come across a website that you like, or if a site displays something you're interested in, look at the code!
Simply right-click on a page, and in the context menu click 'View Source' (if you're using IE) or 'View Page Source' (if using Firefox) - you will then be presented with a separate browser page showing all of the tricks used by the website's author.
Great way to learn, because you can correlate what you see with how it's written.