A buddy and I started writing a brewing app a while back. Long enough ago there were no Android brewing apps at the time. We procrastinated long enough that now there is competition, but what the hell. Right now it's a recipe viewer (reads in BeerXML format) and you can share the recipes. It also has a shopping list function. Here's our webpage on it:
http://www.oneguyinabasement.com/apps/brewer/And here's a link directly to it on the Android Market:
https://market.android.com/details?id=com.oneguyinabasement.brewerEventually we plan to have a full featured version that has mash timers, calculators, etc.