It's a bunch of running games! It seems that after Canabalt came along, speed-based dashing games became a staple genre. There are tons of Canabalt clones around, but these titles do something a bit different than just let you hop over rooftops.
Monster Dash - The most varied running game of the lot, Monster Dash does more than let you hop over obstacles while you sprint. This time, you've got guns! And lots of them, too. Enemies spawn all over the place, and you have to either avoid or eradicate them. Smash crates to get new, ammo-limited weapons, and feast your eyes when the scenery changes to another lush setting! The game tracks tons of stats, making even casual jaunts matter in the long run.
Dead Runner - Here's a neat idea: why not have a first person, 3D running game? You wake up in a dark forest with tortured souls calling all around you. So... let's book it, shall we? Tilt the iPhone to control your direction, avoiding trees, gravestones and the like by keeping them out of the center of view. Two modes of play are available: run as far as you can, and get as many points as you can. Each takes place in the same eerily-lit forest, though the latter is stocked with glowing points orbs. Great gameplay and loads of achievements make it one to keep coming back to again and again.
Cave Run - The most bare-bones dashing game of the bunch, Cave Run has just two goals: don't die, and collect coins to level up. There are plenty of obstacles to avoid, not all of which are harmful to your speed. Online leaderboards let you compete to be the top cave runner in the world, which is something I've always wanted to attain in my life. The flashing level up screen is probably the worst idea in gaming history, but otherwise this is a solid little coin collecting action game.
NOTE: Games listed may not be available outside of North America. Prices are subject to change and are therefore unlisted. Please see the individual game pages for purchasing info.