These're the powers that Paladins get that let them strike more then one opponent at a time.
- Arcing Smite
- Hallowed Circle (Close burst 3)
- Divine Reverence (Close burst 1)
- Crown of Glory (Close burst 1)
- One Stands Alone (Close burst 1)
- Radiant Pulse
- Whirlwind Smite (Close burst 1)
- Hand of the Gods (Close burst 1)
- Corona of Blinding Radiance (Close burst 1)
- Righteous Inferno (Area burst 2 within 10 squares)
- To the Nine Hells with You (Close burst 5)
Not getting into the Paragon Paths, of course. Point is, the only attack that Paladins have that lets them make two regular attacks against opponents is Arcing Smite. The rest are mostly Implement attacks, although a few, like Whirlwind Smite, use your weapon (it's like Whirlwind Attack).