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Malcolm. I use GIMP quite a bit. As you know it will handle fit files, otherwise your working in 8 bit with tiff or jpeg, or 24 bit if using bmp - but the conversion needs to take place outside of GIMP.
It's a bit messy, but CinePaint, a GIMP derivative works in 32 bit which makes it good for converting files, but doesn't have the flexibility of the GIMP tools.
There are two tools that I use almost exclusively in GIMP, EAW Sharpen in local contrast mode (maximum 2 applications at default settings), and Sharpen (Smart Redux) using the refocus plugin and default settings.
These two are gentle applications and can be downloaded from the GIMP plugin repository, or in the case of Sharpen (Smart Redux) it's part of a package containing various Script-fu tools if your using Linux.
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