I ran across
this blog
recently that said you could put ice cubes in the dents and then simply pull up the carpet with a spoon:
Attachment removecarpetdentwithicecube.jpg not found
In the comments, someone else mentioned that would "delaminate" the carpet, and instead, wet a cloth and then iron it on the indention, which they said works great.
Have you all used these options to remove carpet dents, or do you have any other good techniques?