I don't have too many free apps for iPhone\iPod, as I don't use my iPod Touch (1st gen) for much more than music occasionally. I mainly use my iPad, but numerous apps work on both devices by design, not just the pixel doubling trick....
Remote
Google Earth
DropBox
IMDb movies DB
Netflix
Pandora
Zillow Real Estate
Realtor.com
LightBike
But I have bought a few I like for the iPod (and that my kids wanted to play with):
Plants vs Zombies $2.99
Pocket God $.0.99
Angry Birds $.0.99
Sketches (think it was $1.99$)
Crazy Snowboard $.0.99 (My kid bought this on accident, thankfully it works for both iPhone\iPad)
Remote
Google Earth
DropBox
IMDb movies DB
Netflix
Pandora
Zillow Real Estate
Realtor.com
LightBike
But I have bought a few I like for the iPod (and that my kids wanted to play with):
Plants vs Zombies $2.99
Pocket God $.0.99
Angry Birds $.0.99
Sketches (think it was $1.99$)
Crazy Snowboard $.0.99 (My kid bought this on accident, thankfully it works for both iPhone\iPad)