iPhone / iPod Touch Applications?

I've got an iPod Touch and I recently picked up my Canon Xsi and I'm new to SLR photography. I'm wondering if there are any useful applications related to photography for the iPhone or iPod Touch that are worth downloading? I'm sure someones downloaded something good....

The ones I get the most bang out of:
- VelaClock .. Sun/Moon rise/set times and azimuths as well as moon phases.
- PhotoCalc .. Helps with reciprocal exposures, Flash, Depth of Field, etc.
- My E6B .. Aviation software but it can also give me the current weather at any airport with a reporting station. Helps me know which runway is probably in use when I go out to shoot aircraft
- Google Earth .. Helps me identify good shooting locations near airports. In conjunction with the preloaded Maps, I can pick, mark and save good spots.

I'm sure you'll get a raft of other suggestions.

PhotoCalc is definitely a great one. Love it.

Not strictly photo related, but still: http://www.evernote.co​m/

A good blog with reviews of different iPhone photo apps:
http://www.iphoneograp​hy.com/

DOFmaster is a DOF calculator

i just bought photocalc and it seems to do the job. it costs 2.99 which isnt too bad either.

I use photobuddy. It has exposure, sunrise/moonrise, Dof, flash, bracketing, grey wedge, bulb timer, ect. Its pretty good.