Especially noteworthy:

* AT&T caved to pressure to allow VoIP traffic on its 3G data network from the iPhone, something customers have been demanding.

One reason for the demand is that, theoretically, you could bypass paying for a separate voice plan for using AT&T's legacy circuit-switched GSM network. Note, though, that VoIP traffic over the 3G data network will consume kilobytes on your data plan if you don't have an unlimited domestic plan. And if you're traveling out of the country, usage rates can be astronomical, so you're better off using VoIP over Wi-Fi (already supported) in those locations anyway.

* Verizon Wireless said it has partnered with former nemesis Google to develop two open source this year and associated applications.