Macworld takes a look at 11 iPhone GPS apps, following up on a similar article from a year ago (that I somehow seem to have missed). Compared with last year, Glenn Fleishman writes,

Most apps have gone through substantial revisions and improvements, with notable fixes to iPod music control, performance, and address recognition. Still, some basic problems in user interface and finding addresses remain. A few apps haven’t been updated in several months or longer, lacking full iOS compatibility and support. Others retain clunky interfaces borrowed from standalone GPS hardware with vastly less capability than iOS devices.

Major developments include iOS 4 multitasking and, for some apps, iPad versions (the 3G iPad has GPS).