<p>I wanted to see if folks were using decimal for financial applications instead of double.  I have seen lots of folks using double all over the place with unintended consequences . .</p>

<p>Do you see others making this mistake . . .</p>

We did unfortunately and we regret it. We had to change all doubles to decimals. Decimals are good for financial applications. You can look at this article
A Money type for the CLR
:
A convenient, high-performance money
  structure for the CLR which handles
  arithmetic operations, currency types,
  formatting, and careful distribution
  and rounding without loss.