Do the jump or not? Well, if you want to use something like NAVIZON, then you will have to jump :
Guide to native applications for the iPhone
The world of iPhone-native applications has evolved tremendously in the past few weeks. Once requiring a lengthy jailbreaking and installation process and plagued by a dearth of utility, third-party iPhone binaries can now be easily installed (at least under Mac OS X) through a GUI that requires no user interaction with commands or scripts and have matured from proofs-of-concept to include functions that are of use to the average iPhone owner.