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Thanks for the idea of using a PHP redirect script instead of the affiliate URL, I like that one! Cheers

Thanks to both of you for your answers. I will then leave my rewrite rules just in case. I guess they are not slowing down access to the website as they are really simple and quite standard. I suppose that google takes longer to "learn" the new URLs through the redirects.

I am not a fan of CMS, i realize there are pros and cons, but when you try to do too much and be all things to all people you tend to have a lot of compromises. There is one other reason i dont like to use robots,txt, i remeber Matt Cutts saying that it is a spam signal because they can not see what you are hiding, not that it is going to get you flaged by itself, but with other signals it can. If i remember correctly he was talking about hiding malware in scripts blocked by robots. If you are interested, the best CMS for SEO i had found was Orchard CMS but even that has some silly errors, it puts more then one H1 tag in pages, but is still the best solution I have looked at. It is more customizable via code.