I'm new to using IIP in the last 2 months. I was using Bridge to keyword and adjust RAWs and then converting to DNG.
Currently I use IIP to ingest and skip Bridge as part of my regular workflow:
1) IIP makes a primary backup as RAWs first
----I run one photo through first to check my settings, file renaming, folder naming, etc.
----I use the option to file in a folder by date and sometimes camera: ex. 2008-05-04, d300
----IIP adds copywrite info, but not keywords as I'm using hierarchal keywords
2) the RAWs are copied (and converted to DNGs by IIP/Adobe DNG converter) to an 'Inbox', a working/sorting file folder.
3) IIP then copies the DNGs to a secondary backup location
4) Next I import the new photos that are in the Inbox into a Lightroom catalog that only handles the Inbox.
----LR has a keyword sets feature, which are like collections for keywords. Using these speeds up basic key-wording. I wish you could have 12 or 15 in a set instead of 9 though.
----I'm experimenting with making full-size previews rather than the basic ones, so any view is covered. However, it seems that once you make adjustments to a photo, and then later come back to that photo, LR still has short delay to render a view.
----Then I do the usual sorting / adjusting tasks.
----You can create Dev. Presets similar to Peter's RapidFixer - I use the Orange and Blue HSL a lot and have been using the Split Tone for warming the shadows for people pictures on blue sky days, in addition to other presets. To me LR's 5 or 200 point adjustment for WB using an arrow key is ridiculous - 50 and 200 would make more sense. I have few WB presets in 100 point increments.
5) When ready, I move photos out of the Inbox, which are sorted by date, into buckets of about 4 Gigs each - these 4G buckets usually do not have subfolders - the files have a date in their name. I have only done this twice and am using a somewhat clunky method, partly because if I have LR copy the files, I'm not sure how the folder naming/heiarchy will go:
----I determine the files that will comprise 4 Gigs - they could be in one or more folders. While the LR Inbox catalog is open, I use the OS (the Finder on a Mac) to drag these files to their permanent bucket. This bucket (folder) will show up in LR's Folder panel.
----I can still make any overlooked adjustments, etc.
----Since the files are now in their final location, the next steps would be to burn a DVD, export these files from LR and then import into a master LR catalog or just import into iView, etc., and then remove these files from the Inbox catalog.