I found some great tutorials from Stitch Diva:
Quick and Dirty Broomstick Lace
Intro to Broomstick Lace
Intro to Broomstick Lace, Part 2
Working in the Round with Broomstick Lace
Shaping with Broomstick Lace 1 - Decreasing
Shaping with Broomstick Lace 2 - Increasing
And another good one from The Art of Crochet...Teresa
Crochet Cabana and Gritty Knits have good written tutorials on Broomstick Lace. If you need a quick tutorial on single crochet (sc), double crochet (dc), or even how to get started with crochet.. Nexstitch has amazing video tutorials!
So get out there and make some neat Broomstick Lace scarves, wraps, afghan squares, and afghans!!