Thanks useful information: 
It's easier than it looks andylo
The other slider there in the sharpening section of LR is "detail". Now this does get a bit complicated. The detail slider attempts to recover and sharpen small details in the image. It does this by using what's called a deconvolution algorithm. The higher (towards the right) the detail slider is the more the sharpening becomes to resemble photoshop's Smart Sharpen Remove Lens Blur. The lower the value the more the sharpening becomes like photoshop's unsharp mask. I.e. increasing the detail slider actually changes the method of sharpening (well, the combination of sharpening methods). A deconvolution algorithm (which smart sharpen uses and LR uses as you increase the detail slider) attempts to recover detail that is not actually in the photo by examining nearby pixels etc... it predicts what pixels should have been there if the resolution was greater.
Basically, if the detail slider is at 0 the sharpening is the same as photoshop unsharp mask. If the detail slider is at 100 it's basically the same as PS's smart sharpen. If it's somewhere in between it's a combination of both: for example if it's at 25 it's 75% unsharp mask and 25% smart sharpen (basically)
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