We'd planned to role out the new checkout process, along with better shipping rates and all sorts of good stuff, at the same time as the new look and feel of the rest of the site. We had to kill it almost immediately when little bugs we hadn't tested for started popping up.
It's all back up now and seems to be working just fine. If you have any other suggestions, we'd love to hear them. If you catch any problems, we definitely want to hear about those.
Perhaps the biggest functional change is that UPS rates are now automatically pulled from UPS based on the weight of your package. These are our negotiated, discounted rates, so shipping charges have generally gone down. Further, in addition to the free shipping over $95 for UPS Ground, we've discounted other shipping methods on orders over $95. So, if it's ever bothered you that you had to choose between $12 UPS 2nd Day and $0 UPS Ground, that difference is not nearly so stark anymore, offering a better deal on shipping for everyone in the US.
Accordingly, pulling real time UPS International rates has radically improved our offerings there and are generally much less expensive than they used to be for our international customers who choose UPS.
At present, USPS options haven't changed, though we hope to be able to work on those in the next few months.