With the imminent release of iOS 4 today, Navigon isn't wasting any time working on their next update. In the video above they show off what the navigation experience will be like on the iPhone running iOS 4.
Navigon Moblle Navigator Apps start at $29.99 and include built-in maps so that a cell signal is not required to navigate. Nor does it hit your data plan while in use.
You can get the Navigon Mobile Navigator Here for the US and Canada for $79.99 
or
MyRegion US East – covering: (AL, CT, DE, FL, GA, IN, KY, MA, ME, MD, MI, NH, NJ, NY, NC, OH, PA, Ri, SC, TN, VT, VA, WV) Here for $24.99
MyRegion US Central – covering: (AL, AR, CO, IL, IN, IA, KS, KY, LA, MI, MN, MO, MS, MT, NE, NM, ND, OH, OK, SD, TN, TX, WI, WY) Here for $24.99
MyRegion US West – covering: (AZ, CA, CO, ID, MT, NV, NM, OR, UT, WA, WY) Here for $24.99
About Terry White
Terry is the co-author of The Best Selling "The iPhone Book" 1st, 2nd, 3rd and 4th editions. He has been active in the industry for over 25 years and is the founder and president of MacGroup-Detroit, Inc., Michigan's largest Macintosh Users Group, host of the Adobe Creative Suite Podcast and a technology writer - Terry White Tech Blog.
I gotta say, it seems chaotic. I could barely hear what the GPS-voice was saying while the phone was ringing and while the phone call was in progress. Yet, I guess that is better than no directions at all, but still could use a better solution.
On the other hand, the app has no design at all. Just look at that awful main manu! I know it not related to the actual multitasking functionality, but now-a-days its a must, I think.
I recently purchased this app and for the most part I really like it better than my old garmin 505
However for some reason it has recently not taken me to places such as my studio but instead wants me to go 3 or 4 blocks east of it.. I hope this upgrade fixes that..
iOS 4 is finally available!!!!!!!!!!!!
Panorama 3D map view needs some attention under iOS4. Previously, under the old OS, both “USA & Canada” and “Europe” versions worked quite well.