, I use HDR in 99% of my landscape shots to correct exposure, since I don't carry a graduated ND filter anymore.
Workflow to get the initial image is something like: convert RAW to 16-bit TIFF in Nikon ViewNX 2, create HDR frame and tone mapping in Photomatix 3.0 and export it to 16-bit TIFF, open the Tone Mapped image in Photoshop CS3 and merge it with the frames I used to create the HDR by using layer masks.
After that, I remove any nuisances, like dirt marks from the lenses (very common if you're shooting when it's snowing) and start color processing using Channel Mixer. I'll play w/ the controls until I get something close to what I'd get using my old Fuji Velvia 120 film. Then minor contrast/brightness adjustments, noise reduction (Noiseware Professional plugin, the best out there IMHO) and, if necessary, sharpening adjustments.
When I'm happy with the results, I'll save a JPEG in my storage.
I think the Nik suite is great, but I wouldn't buy it myself since I can do everything in Photoshop. I created a lot of actions/scripts for it to automate most of my tasks and that works for me.
Here's a B&W work, also at Mer de Glace: