The video team at About.com recently posted a slip stitch crochet video tutorial. The slip stitch is a really basic stitch only requiring a few quick motions, but it's also a powerful and important stitch to know; you can build entire fabrics using the stitch, and you can also use it to join granny squares, pieces of garments, and other things.
The short video tutorial linked above is a fantastic resource for learning to crochet the stitch, although the video doesn't cover everything there is to know about it.
To teach you more about the slip stitch and its possible uses, I have posted a couple of other helpful resources on the topic.
See Also: Free Crochet Videos and Crochet Stitches Photo Gallery


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