Most memory cleaning tools are not very useful because many of them use ill-advised techniques that are only relevant to older versions of Windows (pre-Vista). Is considerably better because it uses functions built into Windows to judiciously free memory - with no performance impact whatsoever.
http://www.koshyjohn.com/software/memclean/
origin - http://www.pipiscrew.com/?p=2360 app-koshyjohn-memory-cleaner