C-3PO, thanks to his skills as an interpreter, provides a rough Basic-Keshiri dictionary without having come into contact with the language before. Think about it: without having any idea of syntax or grammar, Threepio cracks a language from a recording.
In the opening of Apocalypse, the Jedi manage to simultaneously assassinate hundreds of high ranking Sith with a number of ingenious and perfectly timed plots. All part of Luke's Batman Gambit, one which he pulled on the entire Lost Tribe.
Saba defeating an Abeloth avatar in hand to hand combat by biting its head off.
Grand LordVol and Abeloth's mental duel, which ends with Vol fending off Abeloth's Mind Rape with his own brand, making her retreat in pain. That's right, Vol's so powerful that he can Mind RapeAbeloth.
Mirax Horn's Mama Bear moment - Colonel Wruq Retk has hung her children, frozen in carbonite in response to them succumbing to a form of madness making them see everyone but those similarly affected as imposters, like trophies in his office. Her response to this is to knock him unconscious. To highlight this, Retk is a Yaka, about two meters tall, and with a body frame to match. Mirax is a little over one and a half meters and, though married to a Jedi and mother to two, isn't a Force user. And all it takes is one punch to send Retk to the ground. Do NOT mess with her children.
Luke, Jaina, Vestara, and Ben against ten Sith on Ziost, a world very strong in the Dark Side, meaning that all of the Sith are stronger and the Jedi weaker. Luke and his party-including Ben going up against three Sith Sabers at once-win without too much trouble. The only reason it's not a Curb-Stomp Battle is that the Jedi do have some trouble getting rid of the Sith-but only about as much as Vader had against Luke on Bespin.
Luke Skywalker achieves the pinnacle of his badassery: He and Darth Krayt go up against Abeloth (a being who it previously took the Daughter and Son working together to beat) by Mind-Walking, and defeat her in hand-to-hand combat. Even when Krayt inevitably turns on him, Luke still wins.
Grand Master Hamner's aide, a young human Padawan, deftly talks him out of personally negotiating with the massive Mandalorian force that has just laid siege to the Jedi Temple with orders to force them to hand over the mad Jedi. She outmaneuvers every argument he tries to make, and convinces him that she's the better person for the job, because nobody could possibly consider her a threat. True, she had no way to know that the Mandalorian commander would summarily execute her because she wasn't completely giving in, but it still qualifies.
The trial of Tahiri is becoming more and more of a farce, and it begins to seem impossible that she will not be executed. Despite easily being capable of breaking out at any time, Tahiri refuses to do so, because it would mean turning her back once more on the Light Side.
The showdown between Luke and the Hidden One. Luke manages to show the hidden sect the folly of their isolation, beat the Hidden One in a massive Force battle, and then has his son finish him off with logic.
Luke, after meditating for several days (and being quite weak because he hasn't eaten anything), notices a strike team of Sith Warriors coming to kill him and his son. What do they do? Take them all down.
The battle ends with Luke, in a single, split-second opening, cutting Olaris Rhea (who was leading the squad) into four pieces. She looked away for an instant and that was all she wrote.
In Vortex, a journalist's assistant gets one after said journalist, busy documenting the brutal suppression of a peaceful protest, is herself murdered by the commander of the suppressing army of Mandalorians. This assistant, given orders not to draw attention to himself so that he could complete the broadcast safely, decides to disobey those orders and kicks the Mandalorian commander down a flight of stairs, right into the waiting arms of two Jedi intervening to stop the massacre.
In Conviction, Leia runs to find Allana, who she realizes is acting in accordance with some prophetic dreams she (Allana)'s been having. This leads to Leia having to save Allana's hide from a Sith Saber (Equivalent of a Jedi Knight) leading a force trying to kill her and her mother. The Saber is twenty years Leia's junior, younger, stronger, and quite likely more experienced in combat. In about twenty seconds, he's decapitated without a second thought.
Yet another moment of awesome for Luke: He's up against Sith Saber Viun Gaalan in Backlash, who is said by Luke to be better than Clighal or Luke himself as he was at Sinkhole Station (and as the examples above show, neither of those are at all weak), and pretty much equal to Kyle Katarn or Kyp Durron. Luke matches him blow for blow for a while, until Viun pulls a Screw This, I'm Out of Here!.
Luke gets another immediately after by doing what almost no one in the entire franchise ever thinks of doing, which is grabbing Gaalan's retreating shuttle in the Force to stop it escaping. Gaalan blocks him, but still, points for trying.