I don't know about you, but before I started to write seriously, I didn't mind head-hopping. Didn't bother me in the least.
Now I know better. And it bothers me. Really bothers me. Like through the book across the room bothers me.
It took me some time before I grew to hate head hopping. When I first wrote Woman of Honor, there were a few instances - ok, more than just a few - where I head-hopped. Whoops!
I recently got my edits back for Champion of Valor. I was so pleased that there was only one instance of POV slippage (of course I wish that I had caught them all but still only missing one is definitely a step in the right head-firmly-attached-not-going-anywhere direction).
The offender: Her face paled.
At first glance this might not seem like a POV slip. I, for one, can actually feel myself go pale, but that's just it - I feel it, I can't see it. Her face paled is fine when the her in question is not the person whose POV the scene is in. But in this case, it is. So yes, this is a POV slip.
How did I fix it? A wave of weakness washed over her, and she could feel the blood drain from her face.
Does head-hopping bother you? What areas have you tackled to overcome to make your writing better?