The nerve-shredding safecracking sequence. It's Bad Ass to begin with, but gets elevated to awesome status when Bond not only swipes the documents he was looking for, but also steals the poor guy's stash of Playboys. John Barry's motif for the heist sets the mood.
Tracy's fight with The Dragon, ending with her chucking him down the stairs and impaling him on a wall decoration. The whole fight is an excellent example of Tracy: rather than hiding or being held barely struggling by a mook or the Big Bad like many distressed damsels, she fights back and has no qualms about killing mooks to get out. This trait has been displayed in other Bond girls, but they were often secret agents themselves. Tracy was just a Mafia Princess who didn't take shit.
Tracy's true moment of awesome is during the car chase scene. For the entire sequence, racing along icy mountain roads with a car load of mooks shooting at her, then ending up in a race/demolition derby with cars flying all over the place... and people still shooting at her, she's got an expression on her face that she's having the time of her life.
The best bit of that car chase is when one car makes a 180 degree flip... and the driver makes a slightly annoyed expression at Bond and Tracy.
"Thy dawn, O Master of the World, thy dawn..." Nope. Tracy quoting James Ellroy Flecker to distract Blofeld's attention from Draco's fast-approaching helicopters is her TRUE Moment Of Awesome. She judges his egotism perfectly (he even joins in!), outsmarting him with nothing more than poetry. THAT's cool.
And Tracy lures Blofeld to the top floor of Piz Gloria - the one with all the plate glass windows - to maximize the chance that he will be killed in the initial onslaught...placing herself in increased danger as well...
Back to Bond, when he fights Draco's henchman in the hotel.
And then later when he breaks free of four of them right outside Draco's office: within seconds they're left banging at a locked door while Bond is crouched in Draco's office, ready to throw a mook's knife at him.
The fight on the beach in the teaser. This movie had some of the series' best fistfights.
The film mostly avoids using the Bond theme, but uses it perfectly in the climax. Draco's helicopters launch their assualt on Piz Gloria, Bond jumps out, getting into a gunfight with mooks. He slides across the ice, mowing them down, just as the Bond theme kicks in. Yes.