This tool generates basic block code for you. This is something you have to do every time when you create new block from your module.

Lower-case letters with under-dashes for spaces.
Lower-case letters with dashes for spaces.
Human readable block title.
Check if you do not want this block to be cached, there are other caching options as well (http://api.drupal.org/api/drupal/includes%21common.inc/group/block_caching/7).