Here are the steps I would use to create this effect.
1. Create your base text object. In the initial post this is the legible text with the metallic gold gradient fill.
2. Duplicate the base text. Convert duplicate to path. Inset path. Duplicate this. Offset duplicate by going down and right a few bumps. Select the two paths and do path difference. Fill with a light color. This creates the highlight, which in the initial post is the top-most object.
3. Duplicate the base text again. Convert to path and do outset. Change fill to black. This is the third object from the top in the initial post.
4. Duplicate the object in step 3 and do a path outset. Change fill to grey. This is the fourth object in initial post.
5. Duplicage the object in step 4 and do path outset. Change fill to black. This is (surprise) the fifth object in the initial post.
6. Duplicate the object in step 5 and do a path outset. Fill with the metallic gold gradient fill. This is the sixth object in the initial post. (Only one more to go, yay!)
7. Duplicate the object in step 6 and do a path outset. Fill with black. Duplicate and then offset the duplicate by moving down and right a few clicks. Select both of the objects in this step and perform effects->generate from path->interpolate with exponent 0, steps ~50, method 1. Change the stroke to grey to make it look like the seventh object in the initial post, however the final product looks like they switched that grey to black.
8. Assemble your masterpiece by grabbing each object in reverse order and bumping each successive one to the top before aligning them. Object 6 and object 7 should just about align with the left and top edges, all other objects can align centers with object 6.
Here's my result with this method. I was just doing a quick and dirty version, so I didn't use the fancy gradients, but I think you can see that the result is similar.
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SVG here:
http://files.myopera.com/llogg/files/texteffecttesting.svgJust for grins I did one with a crummy gold gradient. Not happy with the coloring and I probably could have done two outsets on each step, but anyway, you get the idea I'm sure:
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