If you aren’t satisfied with your Android Market purchase, you will have 24 hours to try it out and return your purchase. According to Gizmodo, here is the policy:

•24 hour return period

•The Market will allow unlimited reinstalls of purchased apps.

•Upgrades must come directly from the developer.

•Sexually explicit material is banned from the Android Market.

•Billing disputes must be held with the developer or your credit card company.