Google has pushed an update to Google Voice for iPhone (free) which offers multi-recipient texting, full support for Sprint and one-touch copy/paste in the dial pad, among other things.
The big news is that Sprint iPhone owners can now "send calls the the native dialer," as the app descriptions says. Also, the text entry field now accepts more than one line of text, delighting the more verbose among us.
Go and grab version 1.4.0.2372 now and get chatting.Google Voice for iOS updated with multi-party text, more originally appeared on TUAW - The Unoffi