Ok so here's what I've read up on.. Which ones have you tried and what were the results?
Chinese Gender Prediction Test
About:A chart that takes mom's age at and Chinese lunar month of conception to determine what gender baby will be.
Chinese Gender Chart to Determine Your Baby's Gender
Chinese Gender Chart - Boy or Girl pregnancy calendar predictor
Chinese Gender Chart, Chinese Pregnancy Calendar, Chinese Gender Predictor Calculator
About: Attach your wedding ring to a thread and based on the sway of the ring, a gender will be defined; back and forth = boy, circular = girl!
Wedding Ring Gender Test
Gender Predictions- The Wedding Ring Test and Other Wives' Tales
Baking Soda Test
About: Adding urine to a small amount of baking soda in the bottom of a cup will either fizzle like soda for a boy or no fizz for a girl.
Baking Soda Gender Test | How to and does it work?
Baking soda gender test | BabyCenter Blog
Using the baking soda test as,a baby gender prediction.? - Yahoo! Answers