Tutorials, what kind?

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How about a good down to earth tutorial on special effects stuff like the basic logic behind particle effects n such. I've seen lots of code that generates pretty convincing explosions, but i've definately not caught any good basic explanations of such:-)
Well that's what i'd LIKE to read about, but as far as whats needed, prolly some good tips on file handling and database management. I've certainly been coming to the realization that the best games are often just good databases with some some color and particle effects thrown in:-)

Haveagoodone!