Hi
I posted an idea at blenderstorm a while ago:
http://www.blenderstorm.org/qapoll/ideas/idea/768/
Anyone care to comment on whether they think the idea would work or who might be already coding compositor nodes and have an insight into suitability.
A couple of additional links about lensfun:
One showing the interface for ufraw:
http://prokoudine.info/blog/?paged=2
And the authors site:
http://lensfun.berlios.de/article.php?story=20080527083355760
Thought it might be useful from an animation / batch image manipulation perspective as well.