I'm certainly talking in terms of EQ. Also, I find it important to specify that embellishing voice (dialogue, VO, whichever) is a premixing duty. I usually stick with Pro Tools' RTAS EQ3 7-band EQ which is the most advanced one I have. Here's how I go about it:
I usually look for roundness around 200/300Hz, I-can't-remember-the-name around 3/4kHz and presence around 6/10kHz. I grab a maximum Q/maximum gain point and scan the whole spectrum while previewing the output. On most of the spectrum's width it'll add an unpleasant touch, but there are three points where it sounds less worse and that's how I find my spots. I then lower the gain to +6dB, my Q to 1.5 or 2, and fine-tune the gain, usually around +2 or +3dB. I'll regularly bypass the effect to ensure I'm not making it sound worse.
What way do you proceed? Talk about anything, I read a lot about the aural exciter, you might want to add reverb, a tiny delay to fatten it up, do you ever need to roll out some freqs?... whatever floats your boat, please feel free to share :)