StashBot

Suppose you’re in the yarn store or at a fiber fest and have fallen in love with some yarn. (Happens to me every time I’m near yarn.)
Here’s an interesting app that figures out how much yarn you’ll need for various projects.
http://www.knittersreview.com/article_tool.asp?article=/review/product/141023_a.asp

That looks cool and fun for anybody with an I phone.