I'm pretty sure somebody asked for this before(Quazi, I think), and so here it is. I was needing something to test out my crappy C++ skills on and this seemed easy enough.
Anyways, what this does is does all of the fancy math for you when solving a triangle to use for IK applications. It consists of only one action, which is "Solve IK". In the action, you specify two sprites to act as bones and one to act as a control point. The bones will automatically be rotated and positioned accordingly(the second bone will even position its self to the end of the first bone automatically). Just make sure that the hotspots on your bones are on the far left of the sprite or things might work funky. Also, it's approximately 30% faster than doing it manually.
And, without further ado, here it is:IK Solver Plugin
So, be sure to leave feedback. If you want some more control over a specific aspect or want something added, don't forget to let me know.