Karanbir Singh napsal(a): > what is ISSN ? > What about google... :o) http://www.biocrawler.com/encyclopedia/ISSN http://en.wikipedia.org/wiki/International_Standard_Serial_Number http://fawny.org/issn/?issn In short, it's similar to ISBN but for periodicals (webs, in some countries blogs etc.) People than can include their posts into their publication list. Pages get indexed etc. David