If at any point your alignment changes to non-lawful good, certain of your paladin abilities will cease to function.
Spell progression and powerEdit
Paladins get full caster level on their spells, affecting duration and other aspects.
In order to qualify for the feat Craft:Wand, a paladin must have at least 10 levels in paladin. This implies that paladin levels count for 1/2 for qualifying for crafting feats. It is unknown how this interacts with feats and prestige classes which increase caster levels.
They also get an increased number of spells per day, see: Paladin-Ranger Spell Progression