"Last one" flagged in Watch Lists

Here’s a nice addition to the Watch List I just noticed: an orange tag telling me that a multiple item listing I’m watching only has one left. I’m not sure how new this feature is, but it seems like a good idea. Though it would be even better if eBay would send watchers an email saying “there’s only one left, you’d better come and buy it”. Or, of course, institute a shopping cart like every other ecommerce site on the net.