Lawful Evil:
Lawful evil is referred to as the "Dominator" or "Diabolic" alignment. Characters of this alignment show a combination of desirable and undesirable traits: while they typically obey their superiors and keep their word (trustworthy), they care nothing for the rights and freedoms of other individuals. Examples of this alignment include tyrants, devils, honorable but undiscriminating mercenary types, and soldiers who follow the chain of command but enjoy killing for its own sake.
Boba Fett of Star Wars, and X-Men's Magneto are examples of lawful evil characters. The lawful evil outsiders are known as Baatezu.
Neutral Evil:
Neutral evil is called the "Malefactor" alignment. Characters of this alignment are typically selfish and have no qualms about turning on their allies-of-the-moment. They have no compunctions about harming others to get what they want, but neither will they go out of their way to cause carnage or mayhem when they see no direct benefit to it. An example would be an assassin, who has little regard for formal laws but does not needlessly kill. A villain of this alignment can be more dangerous than either lawful or chaotic evil characters, since he is neither bound by any sort of honor or tradition nor disorganized and pointlessly violent.
Complete Scoundrel cites X-Men's Mystique, Sawyer of Lost as neutral evil characters. Yugoloths are the multiversal representatives of neutral evil.