Pregnancy Calendar - $10
This program will tell you what is happening to you and your baby each day of your pregnancy together with helpful advice and health service information (UK only). You can pick future dates too. It calculates this from your baby's due data, but it can calculate this if you don't yet know. Also, check out the Baby Names application if your stuck for a name.

Tipping Calculator - $10
This is a must for world travellers, Tipping will calculate a tip for any service in any country, and will also advise you if you're breaking any local taboos.