I've just been doing some tests on the 16F636 nanowatt device. 
The datasheet has quite a few TBDs in so I though some figures might be of interest to others...

PIC16F636 current consumption at 3.6V. WDT on, other peripherals off, INTRC oscillator
Impressive figures for WDT current in general, and especially applications requiring more frequent
sampling than possible with the 18mS WDT interval of the older devices. 

For the application I'm working on at the moment, this chip gives a factor of ten current saving
over an ATTiny26...!

Note the increase in current draw with decreasing frequency when using HFINTOSC - this is due to the
oscillator being active for a higher percentage of the time.

Columns are : 

Clock	
Continuously running	
Sleep, WDT waking at 1ms intervals (yes, 1ms!) , minimal code execution.	
Sleep, WDT waking every 30ms, executing 256x bsf/bcf/clrwdt/loop
Sleep, WDT waking every 30ms, executing 16x bsf/bcf/clrwdt/loop


31KHz	17.8uA	10 uA	16 uA	6.4 uA 
125KHz	185 uA	28 uA	105 uA	17 uA
250KHz	194 uA	17 uA	79 uA	10.1 uA 
500KHz	213 uA	11 uA	55 uA	6.5 uA
1MHz	250 uA	8 uA	39 uA	4.6 uA
2MHz	325 uA	6.5 uA	28 uA	3.6 uA
4MHz	474 uA	5.6 uA	22 uA	3.1 uA
8MHz	794 uA	5.5 uA	20 uA  	2.9 uA 
				


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