Alterian, Sitecore, Squiz and Vyre and they all offered relatively similar functionality but the two that stood out most for me were Squiz and Alterian.
Squiz is an Open Source product with a solid backing (the Australian government uses it) and a good support level.
Alterian is a CMS from a company we have currently shortlisted for Social Media Monitoring.
Both offer the sort of functionality we are now seriously interested in implementing such as personalisation of the website for visitors either with login details or via a cookie drop, multivariate testing of content, heuristic tailoring of content based on visitor profiling and closer integration of social media and web 2/3.0 functionality.
It's always a huge decision in deciding which CMS to go with and our current one has worked very well for us but visiting exhibitions and conferences does highlight just how quickly technology has moved on and we're starting to look a little dated. It's the ever elusive quest for perfection and it'll take us a while to get there but it looks as though a replacement CMS may need to be on the cards...
Internet World 2010 is running again tomorrow so if you have a chance to visit it's certainly worth a look around!