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Multiclassing often allows for more versatile characters. Ex. a tank with two levels of rogue gains evasion, which, in game terms, means that if you drop three fireballs on them to kill off the swarm of monsters attacking them, they have a decent chance of surviving.
Another good example is fighter-there is little benefit to doing more than four levels of fighter in a tank (this grants the third level of weapon specialization), and plenty of benefits in using ranger, barbarian, or paladin for the other levels.
As for spellcasters, you can gain a lot with one level of a tank (all weapon skills except for bastard swords, good hp, etc.), but more than one level starts to dilute the spells they can cast (each new level not spent on the main class is one level worth of spells they can't cast). Also, each spellcasting class has a stat that determines their spell's strength, number of slots, etc. Try to keep any dualclassing with casters in the same base stat (ex. sor/bard with Charisma, cleric/druid with Wisdom) as this makes it easier to max out one stat, instead of two.
For this reason, I tend to make tanks multiclass, and spellcasters single or mixin (ie. something like paladin 1/sorceror X).
Just my take. Your mileage, and others', will vary.
-Raffin
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