The Simply Hax Mod for Minecraft was developed to make game play more simple by adding a few shortcuts (or hacks.) This mod includes features such as a flying ability - similar to the ability found in "creative" mode. It also includes somewhat of an x-ray vision to find new cave systems.
Lastly, this mod enables the player to keep an inventory on death. This inventory is best used after falling into lava, or perhaps, after a player perishes while exploring – granting the luxury of not being required to re-track your own steps.