I have released an iPhone app called Greek Symbols. It lists the greek letters and their names. I use it when I encounter them in math books. It's for sale for $1 here:
The app store approval process went very smoothly for me. No pain, no problems, and it only took them a couple days. Some people have bad experiences and complain online. Some other people try to judge the app store based, in part, on the non-random sample of app store experiences people choose to post online. That doesn't work well because many of the people with good experiences don't care to say anything. But I'm saying something: Apple's app store approval process has treated me very well so far.