I'm new to SEO, so excuse my stupidity, but I just read the Google Webmaster guidelines, and found: "Don't use "&id=" as a parameter in your URLs, as we don't include these pages in our index." I didn't know this, and I suspect that a lot of online shops don't know it too. Is it only true for exactly the parameter name "id", or do "sid", "pid", "product_id" etc get ignored too? If so, I need to change my website in a hurry!
I have productid, menID, catID and they are all indexed. It seems to be that id= with nothing else is a problem.
The main problem is when this id= represents a session ID. Each time the bot follows a link, it gets a new session ID and it revisits the same page again and again, each time with a new session ID. Jean-Luc