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Google seems very capable of indexing XOOPS sites. This is because it has adopted a policy to index through query strings. This is not the case for many other S/Es. You need to go to CMSwatch if you want more details on this.
If you really want to prepare your site for maximum S/E friendliness, I suggest you look at implementing one of the short URLs hack by kenogui and Reynaldo. This requires the apache mod_rewrite module on your server, plus a short script and .htaccess file. Its all detailed in the hack. See
THIS LINK Just out of interest here... On my test site I have instructed NOINDEX NOFOLLOW and the googlebot is still sniffing around!
Richard