YiHaoDian (1号店), one of the biggest online supermarkets, has launched an English app designed from the ground up for expats. They've got over 100,000 items on there with English titles and info. That's only 10% of their estimated 1 million items on their Chinese store, but the items on the English app are those that Yi Hao Dian sells directly themselves. We've played around with the app a bit, and it's cleanly designed and quite easy to use.
Prices are generally cheaper than physical supermarkets and they sell electronics and household items, in addition to food.
No English version of Taobao yet, but life just got a little easier for online shoppers.