In Japanese writing, a central dot (called an 'interpunct' in English)・is sometimes used instead of a commas when writing lists.
It is also often used instead of a forward slash / to separate parallel alternative words/phrases/ideas, but sometimes for this they do use forward slash / like in English.
Check out this link for a better description of what ・ is used for:
http://en.wikipedia.org/wiki/Interpunct#Japanese
It is also pretty handy for making bullet point lists when posting online:
・point #1
・point #2
・:)