There's a developer (dotnet) on the Rainmeter Forum working on a Plugin for ATI cards that DOES NOT require third party software like Speedfan to run. He needs someone running in crossfire mode to help him with testing out the plugin. He's already done a pretty impressive job. I run 2 ATI video cards in my system (not in crossfire) and it works great.
Rainmeter Forum Thread
The list of measures..........
Temperature
Clock
Voltage
Activity
PerformanceLevel
PCIECurrentBusSpeed
PCIECurrentBusLanes
PCIEMaxBusLanes
MemoryClock
FanSpeedRPM
FanSpeedPercent
MemorySize
MemoryType
MemoryBandwidth
NumberOfAdapters
AdapterName
<-NEW->
AdapterActive
FanSpeedPercentMin
FanSpeedPercentMax
FanSpeedRPMMin
FanSpeedRPMMax
BiosDate
BiosVersion
BiosPartNumber
AdapterIdentifier
NumberOfDisplays
DisplayConnectorType
DisplayConnected
DisplayMapped
DisplayType
DisplayOutputType
DisplayName
DisplayManufacturer
DisplayCurrentResolution
DisplayNativeResolution
DisplayMinResolution
DisplayColorBrightnessCurrent
DisplayColorBrightnessMax
DisplayColorBrightnessMin
DisplayColorBrightnessStep
DisplayColorBrightnessDefault
DisplayColorContrastCurrent
DisplayColorContrastMax
DisplayColorContrastMin
DisplayColorContrastStep
DisplayColorContrastDefault
DisplayColorSaturationCurrent
DisplayColorSaturationMax
DisplayColorSaturationMin
DisplayColorSaturationStep
DisplayColorSaturationDefault
DisplayColorHueCurrent
DisplayColorHueMax
DisplayColorHueMin
DisplayColorHueStep
DisplayColorHueDefault
DisplayColorTemperatureCurrent
DisplayColorTemperatureMax
DisplayColorTemperatureMin
DisplayColorTemperatureStep
DisplayColorTemperatureDefault
It also includes bangs to change fan speed and a whole lot more.