Here's my workflow for scanning, inverting and adding to library. Pointers are welcome. I'm always on the look-out for some software for OS X that will invert images using Automator. Sadly Pixelmator won't do just that through Automator and the 'Quartz Composition Filter' blows the image to hell, It can't handle tiff-files anyways..
[1.] I've decided to only shoot Ilford FP4+ 125, develop in Caffenol-C for 12 minutes (thinking about pushing, need to research), Ilford fixer for 4 minutes if still 'fresh'. Rinse with normal tap-water, last rinse with distilled water.
[2.] Hang-dry.
[3.] Compressed air to fight the dust from the drying process.
[4.] Using VueScan, I do a quick preview scan for each image. As I come across anything interesting I do a full 7200 scan through my Plustek Opticfilm 8200.
[5.] After going though and hopefully scanning a few images I end up with the negative scans in my 'Pictures\Scan'-folder. The next step is done by using a Automator-made Finder service involving Aperture and a Aperture preset I made.
The preset is just an invert of the curves, hence giving me a positive image.
I used to crop and invert each image in Pixelmator. These days I have Automator import the images into Aperture and do the inverted curves preset.
[6.] I crop off the 'scan-bleed-edges' if needed but usually I just leave it as it is.
[7.] If I want to adjust light, dark, mids I use the 'Levels'-adjustment instead of using curves.