Amazon has just released their “Amazon Prime” service. For $79 per year, you get unlimited 2 day shipping (and overnight shipping for only $3.99) I don't know many people who would be willing to cough up $80 a year for this, but if you order often then I imagine it's worth it.
http://www.amazon.com/gp/subs/primeclub/signup/main.html/ref=amb_promo_183711_2/102-2516103-4662553
Still, ya gotta admit it's pretty clever. I hate paying shipping costs.