Prepare archive copy of files
Make copy of files (including Deleted folder) in a separate folder "Photo Originals". When there is 650mb of image files I cut 2 CD's for archiving. I have been using WhereIsit? to store a catalogue of these files, but I have just got iMatch and expect it to replace this function especially when CRW becomes a supported format.
More on archiving

• Batch process in Adobe Photoshop
  Use batch action in Photoshop. This tends to vary depending whether I am creating images for the web or to store in local image catalogue.
  More on batch processing

• Review results
  I review these files to see whether any additional processing is necessary. The most common thing I find I need to use is a levels adjustment to increase the dynamic range. (I have added this adjustment as the Range Fix option in LinearSharpenMenu.) Occasionally, I apply contrast mask to bring out lowlight detail, although this has the downside that the image has to be converted to 8-bit.

• Create output versions
  If I am going to include any of the images in my online galleries, I run an action that creates JPEG files in thumbnail, intermediate and high quality sizes. For my local album I create a full-size, high quality JPG.

• Update EXIF data
  Where the batch process has created JPG files, I use BreezeBrowser Tools>EXIF Copy to tag EXIF data onto these files (apart from thumbnails) and apply the EXIF date stamp.

• Tidying Up
  I've got plenty of disk space so I tend to let the TIFF and PSD files hang around a while, and clear them out every now and again. I don't bother to keep the PSD files unless I have done some complicated manipulation. I figure (a) it's pretty easy to go back to the raw and do it over, and (b) I've only been using Photoshop for just over a year, so if I go back to an image I reckon I will do a better job than I did the first time.

A good reference for further discussion of workflow for the D30 can be found on Don Cohen's site. There is a comprehensive workflow for editing images in Photoshop on The Luminous Landscape website.