Glyder is a fun, casual--and relaxing!--flying game, in which you pilot a hang-glider through dreamy island environments to the constant beat of a chilled-out soundtrack. The game makes simple but smart use of the iPhone and iPod Touch's accelerometer controls: you tilt up to climb and down to dive, turning left and right to steer (whether sharply or in broad, arcing swoops). You gain altitude by flying up into well-marked thermals, and you build up speed while diving. If you go too slow, you'll stall--but the game is extremely forgiving, allowing you to carefully conserve your momentum and fly for extremely long periods of time.
The nominal object of the game is to collect floating, multicolored crystals in six different and distinctive "lands" (which you fly between in real time, over a tranquil sea), and the game offers up many different console-style achievements, a lot of which involve flying from one free-standing platform to another. There are no timers and no scoring beyond your crystal count, though. Glyder is definitely a game about the metaphorical journey rather than the destination.