Some ways to pass the time… not that I’ve had much lately.
Beast
Beast is the first computer game I can ever remember playing. I half-wish someone would port it to OSX… or maybe iOS – but only half-wish, because I know how much time would get sucked out of my day playing it.
Quake II

It’s true I have an extreme affinity for Quake II, even so far as to have a permanent running Q2 server at Server North (Q2.SVRNI.ca), but this is the exception. I seem to prefer playing simple, low-paced games.
fl0w

fl0w: Probably one of the most beautiful and simple games ever made. Unfortunately I rarely play this, since it’s Flash based, but would love it on iOS – legally.
Strategery
Strategery: Current chronic addiction for over a year, play me on GameCenter!
Some others…
– Samegame (mostly on PalmOS, ie: not anymore)
– Crusher Lite
– Weave, just started playing with this, very… relaxing
– Balldroppings… boing boing boing…
– Solitaire… although not much given the omnipresence of my iPhone and the above games.
Do you have any other recommendations? Similar games you love? Do you play any of these?