OK, so what's your point - XAMPP contains lots of stuff that SME already has (if so see above), or that it's tested on SuSE, RedHat, Mandrake and Debian, and so by implication not CentOS? Is CentOS not itself a modification of RHL?
But like I said above, I am testing it in a non-mission critical environment, along with several other distro's. I have taken on board all of what has been saild above, and it maybe that ultimately it isn't suitable for what I want. But at the moment it is looking like a very strong contender, thanks in no small measure to the help and advice I have already received here.