It should be noted that Mab's idea of physical therapy is a new and creative method of attempted murder each and every day for three months. And as a Faerie Queen, she has a lot of creativity at her disposal.
Said verbal smackdown was so effective, Maeve got angry enough that everything in the area started frosting. Including the ice. The freakingice iced over.
Almost immediately after said verbal smackdown, Harry politically out-maneuvers Maeve, blows an ogre into bite-sized chunks of gore, repeats the stunt with an uppity Fae lord, and lays down the law in regards to the Faeries' interactions with mortals (while he's around).
Another moment for Sarissa, for cleverly concealing iron in her hair sticks, using it on the aforementioned ogre, in front of Mab. For an analogy, Sarissa basically flaunted kryptonite in front of Superman.
Becomes a moment of Fridge Brilliance when her relationship to Mab is revealed later, in that the only repercussion she faced is being asked to dispose of it safely. Mommy's fine with her protecting herself, just be careful!
The fight at the bar. Harry shakes off Sharkface's mind-whammy, then chucks fire hotter than anything he's ever done at him, before punching him in the face with his fist encased in ice.
Karrin Murphy's one woman Big Damn Heroes moment for Harry in the Botanical Gardens, which is quickly followed by Cat Sith's own. "Hey, weren't there seven of you guys a minute ago?"
Harry: "Join, hide or die. Those are your options when The Wild Hunt comes for you. Tonight the Hunt is joining me."
The Erlking: "Sir Knight, what game amuses you this fine stormy evening?"
Does that make it less awesome or more awesome? That means Erkling and Odin chose to bet on Harry, when they could have chosen to simply charge into battle themselves.
Likewise, Harry and Murphy riding with The Wild Hunt on Murphy's magically tranformed Harley... across Lake Michigan. And they take on a small fleet full of Outsiders and their mortal minions, and still find time to fit in a Big Damn Kiss or two.
Karrin: You want me to drive into the lake
Harry: You have to admit, it isn't the craziest thing I've asked you to do. It isn't even the craziest thing I've asked you to do tonight.
Karrin: You're right. Let's go.
While being mind raped by an Outsider, by sheer force of will, Harry breaks the control then basically forces the thing to give him its name and provide him with the knowledge necessary to beat it.
Harry: "I AM HARRY BLACKSTONE COPPERFIELD DRESDEN! Thrice, I command thee! Thrice, I bid thee! By my name I command thee! Tell me who you are!"
Sharkface: I AM GATEBREAKER, HARBINGER! I AM FEARGIVER, HOPESLAYER! I AM HE-WHO-WALKS-BEFORE!
He then shuts it down by shoving a gun into its mouth and blowing it away, channeling a spell through the barrel as he pulls the trigger.
And he did it to the tune of Queen's We Will Rock You.
Harry: "Hey, Sharkface! Get rocked."
Harry finally throws down with Fix while naked and without a single weapon outside of a rusty nail and his knowledge of the island. He uses that along with some well placed taunts to dominate the fight.
"And for the first time in a decade the Winter Knight and Summer Knight went to war.
Plus after resolving their differences, the subsequent team-up to take on Maeve's retainers.
Every time Mab is ever referenced, Harry makes it a point to tell everyone how powerful and frightening she is. During the climax, after Maeve is shot dead and Molly becomes the new Winter Lady, Harry ensures everyone is safe within the cottage on Demonreach, pulls Mab aside, and very quickly and calmly puts a gun to her head and shakes her down for answers.
Harry: "Demonreach, if our guest pulls that trigger, take her below and keep her there." Cue Oh Crap from Mab
And then she smiles and says that just maybe she'll finally get a Knight who is Worth It.
Toot and the Za Lord's Guard putting up a fight against hostile Little Folk that Harry compares to 300. Complete with equating Toot himself to King Leonidas.
Harry defies the force of will attack of MOTHER WINTER.
Molly manages to make an illusionary fog large enough to completely conceal an entire boat and its wake, despite being over water, which makes it much harder to work magic.
A lesser, but still awesome, example of Molly's power: She manages to completely and flawlessly veil the hearse Harry has been given by Mab. While driving it. While having a rather detailed conversation with Harry. All at the same time. Harry is simultaneously proud and impressed.