Vadderdung - I'd lump him in with knowing Gard is an actual Valkyrie + what he saw in Monoc HQ as  knowledge/miscellanous. It is definitely a knowledge boost with very wide ramifications (helloooo old norse gods running around etc.).

Custodianship of the Swords - knowledge (via Molly's research he's learning some interesting things about the wielders) + alliance with the Knights and Church as an organization, not individual members.

That little crystal thingamajig he gave to Molly in Turn Coat to protect her and Thomas - Eb was surprised/interested that Harry "finally made that idea work" and again per Eb, the thing would've levelled the hill on the island if messed with. Skill.

Another from Turn Coat - strangulation with force+soulfire combination spell; took a hell of a lot of finesse and control, not something Harry had been known for up to that point. Skill.

Changes - combination fire / ice spell in Chicken Pizza of which Lea was most approving (she noted that very few could do a spell like that). Skill.