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Very nicely done site.
I don't know if you have looked into using zlib/mod_gzip to add compression for your php/html files, but that would save a lot of bandwidth and load times.
I believe XOOPS has a setting to enable this system wide, but it is not recommended for some reason. All I did was read this article
Here and ended up only using the "Easy" method, and pasting one line into all the index.php files on my XOOPS site.