Articles: Sharpening for Print and Web
The Print Sharpening Class
For prints that will blow your mind.
Remini
Don't trust it.
Noise removal and sharpening – the leap of faith
You won't believe it until you see it.
Understanding Unsharp Mask
The original sharpening method, and still the best.
Sharpening for web
The method I've found works best for me.
Topaz Sharpen AI
Putting it to the only test that matters.
High Pass Filter Sharpening
This might be useful occasionally.