iOS 5 - yes!

To the previous poster, I havent heard of any app incompatibilities with older apps on iOS 5. I dont think it is like computer OS upgrades that sometimes do break applications.

I upgraded to iOS 5 yesterday, and the first thing I did was upgrade to iGo Primo North America. I have the Verizon iPhone, and it would not allow Primo on less that iOS 4.3 (Verizon phones were 4.2.8). I only played with it for a few minutes but it appears to work fine, and is better than the older iGo.

Yticolev about North America - iGO primo app, v2.1.5