Some of the more important:
– Added reporting of TRIM command capability (for SSD)
– Improved support of nVidia GT21x series
– Fixed support of several nVidia GPU sensors
– Added preliminary Sandy Bridge support
– Improved general handling of sensor monitoring, added possibility to clear stored preferences
And of course better readings from a whole bunch of sensors and support for many news chips. The entire list of news can be found at the official website.