Toktumi works similarly to Google Voice, letting you use one virtual number to forward to your real numbers. It doesn't support SMS, and it costs $15, but it supports business features like phone trees and other filtering options. The Line2 app is by Sean Kovacs, the guy who made "GV Mobile", the Google Voice app we still use on our iPhones now.
Since Toktumi is a paid service, Apple probably believes it won't directly impact At&T business and it doesn't support SMS either which makes it a less preferable choice. At the same time, they might be interested in pushing toktumi ahead of Google Voice App to get as many users under this app and make it difficult for google voice to gain these customers.
Whatever be the case, the Mobile VOIP Application and the entire VOIP market in USA would face huge turmoil in 2009-2010. Lets hope we see some really good innovations and value addition to VOIP service.
I want to quote your post in my blog. It can?
And you et an account on Twitter?