Also very interesting (this is the economist in me): the implications of such services for the labor market. Seems to me an enterprising student/housewife / retiree could put together a tidy little income from working Instacart, Taskrabbit, etsy and Craig's List, with a much better fit for one's schedule. Downside, of course, is no benefits.
Another amazing user interface is www.gumroad.com -- which I'll be using shortly for some of my ebooks. Meanwhile, you can get my ebooks on amazon and a few on iTunes-- plus, there's one that is a free PDF download. Check 'em all out here.
>See NYT article on Instacart (via Tyler Cowan's Marginal Revolution).
More totally random cyberflanerie:
Mr Heisenbug: Respect the Microbiota (not the voodoo doughnut, I guess).
COMMENTS always welcome.