* Logo image native size: 48 h x 62 w (pixels)
* Screenshot image native app:240 h x 320 w
* How to compute checksum: use sha1sum in linux on the tar/zip file, e.g. <code>sha1sum XXXX.tar.gz</code> or in Windows (yes some people use Windows) use the HashCalc utility from http://www.shareup.com/HashCalc-download-22889.html