On the back of Jason saying he was looking for a replacement CMS I've asked about and trawled through the net with the following results. It may or may not be of use.
WebGUI - http://www.plainblack.com/webgui Appears to be very popular and was recommended by quite a few people. Performance is very good as are the features it offers Quick overview available here http://www.cmsmatrix.org/matrix?wid=2&func=viewDetail&listingId=1001
Mambo - http://mamboserver.com/ Recommended by many people to me, and has glowing reports from all the sites I visited. Certainly my favourite. Quick overview available here http://www.cmsmatrix.org/matrix?wid=2&func=viewDetail&listingId=1074
Confluence - http://www.atlassian.com/software/confluence/ This was recommended to me by a friend. I am going only off his recommendation. I've looked at other websites that use it and it appears to be good, although I don't have any performance statistics.
OpenCMS - http://www.opencms.org/opencms/en/ This was also recommended, but I wasn't overly impressed by it.
OpenSourceCMS - http://www.opensourcecms.com/
Overviews and statistics of many CMS' can be found here - http://www.cmsmatrix.org/
Regards,
Gedi.
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