Topaz labs recently released Topaz Clarity! This is an awesome plug-in that gives you complete control of all of the aspects of contrast in your photos. It is kind of like the Clarity Adjustment in LR and ACR, with one major exception! It breaks down the single clarity adjustment into 7 easy to control adjustments that give you a greater amount of control over the contrast in your photos. They are essentially more localized contrast enhancers, not global ones like clarity and your typical contrast adjustment.
Topaz Clarity is sleek and clean backed by intense contrast power. I have found it to be a quintessential contributor to my 32 bit HDR workflow. Check out this tutorial for my new 32 bit workflow with Topaz Clarity.
You can buy it for $29.99 until May 31st with coupon code claritynew at checkout.
After May 31st it will retail for $49.99, get it while it is hot (and on sale)!!!
While you are there, why not grab Adjust while you are at it?