Yes, this is fairly common. The two links below list the cabinet members 
under Reagan and Clinton. Clinton had 6 posts change in 1997, and Reagan 
had 7 change in 1985, not to mention several changes in other years 
under both presidents.

http://www.infoplease.com/ipa/A0101271.html
http://www.infoplease.com/ipa/A0101275.html

Matt

Fish wrote:

> Erin Frey wrote:
> 
>> Has anyone heard about the Cabinet resignations? (ie. Colin Powell)	
>> Bush said it was due to burnout, I wonder what is really going on?
> 
> 
> 
> Here's the NyTimes article:
> http://www.nytimes.com/2004/11/15/politics/15cnd-cabi.html?ei
94&en=e6d4c24b00751519&hp=&ex 00581200&adxnnl=1&partner=homepage&adxnnlx
00544873-2i0tPh9wO+HdhCd+XqVLKA 
> 
> 
> What I don't know is how common this is.  Did Clinton's cabinet have 
> similar turnover?  Reagan's?
> 
> B-
>