I've been extremely happy with USPS in the past - their support for their Web Tools is great. However, they screwed up big time on this one. I got the notification e-mail at 4pm on Friday, saying the API would change on Monday. I promptly called them and spent 30 minutes registering my extreme displeasure at the way they handled this. (BTW, they had already heard from others - I think the message is getting through). The phone number is 1-800-344-7779 - I urge everyone who uses the USPS web tools to give them a call.

On the positive side, the changes are being made only to RateV2 and IntlRate. The USPS module uses RateV3 for domestic shipping - that won't be affected.

For international shipping, there are some changes to the XML returned for First Class services which will probably affect Ubercart. However, since there's no way to test any fixes until the new API makes its debut on Monday, we'll just have to wait and see if things break.