SpeedFan 4.31 is available. A lot of users should find this release interesting because of W83627DHG support. Starting with 4.30 new hardware monitor chips are fully supported, like ADM1026, ADT7473, MAX6640 and SCH311x. Added full support for Intel 631xESB and improved support for ICH7-M. Fixed support for other chips and added new advanced settings for some of them. Added full support for the internal temperature sensor from K8 chips on multiprocessor systems. There are several bug fixes and performance improvements too.
If you are planning a software upgrade and would like to move to Vista, consider that SpeedFan is compatible with it too. The 32 bit version works fine already. For the 64 bit version I made some tests and SpeedFan will work fine on it too.
Source:SpeedFan 4.31 is available