Blackdrazon: Several of the other Dragon Quest games have job systems as well (III, IX, X), although I can't vouch for what they're like.
I have played 3 and 9 (not 10, which I hear is an MMO), and can describe them.
DQ3: You have a Hero (who must always be in the class, but whose gender can be chosen at the start of the game), and 3 other characters. Class change is possible at a certain location, but you need to be level 20, can't be the Hero, go back to level 1, and lose half of your stats. You do, however, retain any spells you have learned. (Note that, if you are going to play this game, I recommend playing the remake; the original has some nasty bugs and also has some poor growth mechanics that make Vitality and Intelligence seeds worse than useless.)
DQ9: All your characters (including the main character, who always starts as a Jester (or whatever that class is called)) can change class at that special location. Doing so takes you back to level 1 with level 1 stats, and you lose your spells, but you retain the skills you learned with skill points (including stat boost skills) as well as unspent skill points. Leveling up in another class will allow you to gain extra skill points, as many as leveling up the class as your first class would. Changing to a class you were in before will restore your former level (unlike in DQ3, where doing this would put you back at level 1 again).
Note that, in these games, character level and class level are one in the same, unlike DQ6, DQ7, and FF5.
dtgreene: Unfortunately, in FF3 (which I have played, both the Famicom and DS versions):
* There's no way to use an ability learned in one job in another, so you don't get the ability to combine abilities in interesting ways
* HP growth depends on the job you are in at the time of level up; I really dislike this sort of mechanic
* The random encounter design is rather bland; random encounters in any given area are all pretty much the same (this is something the original Final Fantasy did much better)
* Some jobs appear too late in the game (in particular, the advanced spellcasting classes)
adaliabooks: Plus the non replenishing spells in FF3 made spell casters pretty much useless I found. It's job system may have been the starting point for V but it's nowhere near as good.
There are enough Elixirs in the game that this isn't as bad as you might think, plus you can get double digit casts of each spell level.
The main problems with spellcasters were that:
* Attack magic was too weak to be useful. Exceptions include the early game (especially in DS), and the advanced summons in the original version.
* In the DS version, status ailments were mostly useless. (This is in contrast to the FC version, where status ailment spells were incredibly useful.)
* The advanced spellcasting jobs came too late in the game, and the basic ones don't get enough casts of high level spells.
Final Fantasy 5 has much better physical/magic balance, though for a while physical attacks end up being too weak (particularly in the second world).
