Via Brett Terpstra:
I wrote a quick script to allow me to search for an iOS app by name and instantly write its 1024px version (or the highest resolution available) to the current directory in Terminal. There’s also an OS X application version at the end of this post, so you can perform this trick without needing the command line at all.
I came across this nice OS X script for fetching the logo from your favorite app in App Store. Works great!