For example this: http://support.yardbook.com/faq-i-want-to-measure-lot-sizes-...
And, of course, even if it were just a re-skinned CRM, having it appear to be niche specific makes it easier to sell. "You understand me and my business..."
Not in the business, but I used to hang out there when I was looking for software business ideas.
We found that for industries where technology isn't ubiquitously used, the one-stop-shop model is tremendously critical.
That being said, and to your point, we have a material portion of our core technology (invoicing, scheduling, billing, etc.) that is 'transposable' to other markets. We are definitely thinking along this line but it is part of the long term vision further down the road.