Just wanted to expand on my previous review.
I used to print out and take paper copies of maps and other travel info on road trips. Since getting an iTouch, and more recently an iPad, Im helping to kill less trees. Some of those maps however, are huge. Even my Core i3 desktop lags when trying to zoom and pan them. Not so with Maplets. Fast, fast, fast! The touch interface also works so much better for viewing maps.
You cant add your own maps directly, but have to download then from the Maplets website. That seems to be part of what makes the viewing so fast. Browsing for maps is quite easy and can be accomplished in several ways. The map library seem to be quite large, but if a map isnt available, you can request it. My request was fulfilled in less than 24 hours.
All in all, Im quite happy with Maplets.
dgtang about Maplets – The Offline Maps App, v1.5