Thanks for the comments. Here is what I do.
My standard equipment is 40D, 100mm macro lens and Sigma 140 macroflash. Sometimes I use Sigma 180mm macro if I need to stay a bit further away from the subject. I put the camera in M mode with SS at 250 and Aperture 16, occasionally 22, ISO 200. Flash in e-ttl mode usually with power 1:1 but sometimes 1:2 depending on the subject. Lens in MF mode. I try to get as close to the subject as possible. I take exclusively in RAW and hand held.
I use Ufraw (a free software) for raw conversion. Ufraw allows for cropping, brightness adjustment, colour correction, contrast adjustment (either altering linearity/gamma or using curve - or both) and rotation if necessary. I convert the images to jpeg at 85% compression. I use GIMP (another free software) for image editing. Occasionally I use the large jpeg images for minor rotation or other correction but mostly I resize the images first using Irfanview (another free software) before final editing. I sharpen the resized images in Gimp using unsharp mask set at radius 0.2, amount 50%, threshold 10. I need to run this setting usually only once but occasionally twice to get enough sharpness. For some images I use selective sharpening by selecting an area. For a few images I enhance the local contrast by running usm at 30, 20, 10. Other minor corrections, such as removing dist spots, are done at this stage.
That's all. Now I am ready to upload the image.
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Gautam