This page contains links to SD card images for various Linux distributions.
This mirror service is provided by peir.com in support of, but not part of, the Raspberry Pi Foundation.
Reference root filesystem from Gray and Dom, containing LXDE, Midori, development tools and example source code for multimedia functions.
The SHA-1 value is a hash code used to check that a file has been downloaded successfully. After downloading the file you should use sha1sum and compare the result to the value given above.