I love zig-zaggy woollen things, having done the Chevron scarf and all, and was looking for a project-on-the-side to crochet. Look what I found:
Comfort Stitching's Zig Zag Blanket.
More research on a really boring Monday afternoon yielded these:
Attic24's neat ripple pattern comes highly recommended
eHow.com's crochet zigzag throw and
freevintagecrochet.com's crocheted zig zag afghan