For many of my important cpc campaigns etc.. I have added an affiliate code to my homepage e.g. /home.php?aff=4534 Will google look at this as a different page to /home.php or is it smart enough to understand what im doing? If not am I loosing valuable pr/serps results because of this?
Google is not smart enough to recognise that /home.php?aff=4534 is the same page as home.php. it will think you have 2 pages with the same content. You need to write some code at the top of home.php to set the cookie or session and then do a google friendly 301 redirect to home.php