Final Fantasy Tactics is made by the Yasumi Matsuno led team, which made five games...
Ogre Battle(Snes, remade for Saturn/PS 1)
Tactics Ogre(Snes, remade for Saturn/PS 1)
Final Fantasy Tactics(PS 1, remade for PSP)
Vagrant Story(PS 1)
Final Fantasy XII(PS 2, got an updated version for Japan PS 2 also)
If you want to see what FF Tactics is like, I recommend three games which are extremely similar, maybe the most similar tactical rpg's out there? ...
Tactics Ogre(Snes, remade for Saturn/PS 1)
-The Snes version only came out in Japan, and there is no English translation for the Rom. You can buy the PS 1 version in USA, not sure if the Saturn version came out in Usa
Final Fantasy Tactics Advance(Gameboy Advance)
-This has some of the same development team as FF Tactics. Try it!
-Final Fantasy Tactics A2(Nintendo DS out on June 22nd)
-This has nearly the same team as FF Tactics Advance, it's not out yet though. It's extremely similar to FF Tactics Advance, although those two are more similar to each other than to FF Tactics I believe.
I'd recommend Tactics Ogre first, then FF Tactics Advance, and later try FF Tactics A2 when it's out.
Also, here are the top tactical rpg's out in 2006, 2007, and 2008 already...
Disgaea 3(PS 2 8-29-2006)
-This game was pretty popular also, I haven't tried it though.
Jeanne D'Arc(PSP 8-21-2007)
-This is a Level-5 made game, it was given high ratings by users and critics but I don't think the sales were high, nevertheless tons of people on this forum and eyesonff.com were playing it. Try it also.
Final Fantasy Tactics: The War of the Lions(PSP 10-9-2007)
-This game got high critical and user reviews and had the highest first week sales of any PSP game in the second half of last year I think. Tose ported the game from PS 1 to PSP under the supervision of Square Enix. Tose and Matrix Software do porting for Square Enix, research them. And buy this game right now!!! :)
Front Mission(DS 10-23-2007)
-This is Square Enix's other tactical rpg series, it's set in the future with huge customizable war machines called Wanzers that you command, it's military style, this game I gave 9/10!
Disgaea 1(PSP 10-30-2007)
-This is a remake of the popular first game, popular for PS 2, haven't tried it.
Fire Emblem: Radiant Dawn(Wii 11-6-2007)
-I haven't played this game but it was pretty great I here, I want to play it also.
Final Fantasy XII: Revenant Wings(DS 11-20-2007)
-I don't call this a tactical rpg I call it a real-time strategy rpg, I gave it a
9.5/10! The only other rts rpg I know of is Heroes of Mana(which wasn't real great) for DS, whose team is making Blue Dragon Plus now.
...
Upcoming top tactical rpg's out this year that I know of...
Final Fantasy Tactics A2(DS 6-24-2008)
-Yea, buy this the day it comes out like me!
Disgaea 3(PS 3 probably 8-26-2008
-This game will be popular, try to rent it.
Edit, go here...
http://en.wikipedia.org/wiki/Final_Fantasy_Tactics:_The_War_of_the_Lions
http://na.square-enix.com/fftactics/