Think of tags as like a book index where you find words and which pages they are on, the same principle applies here. Although it's taken a stage further so it might not be the word, but the subject, so for example if you're looking for things to do with fractal gradients for example. A tag may bring back posts with gradient files, as well as posts that discuss gradients, or tutorials about them.
Just a bit more fun with the flame game, based on Rick Sidwell’s excellent guide to Blur . This time I remembered I’d used gaussian blur as part of the Cosmic Scripts so I ran a few of those to get some ideas, then ended up tweaking and making the last final a glynnsim1. Here’s the flame.