From what I believe this series is made by tri-Ace (the guys behind Valyrkie Profile, Radiata Stories, and Star Ocean) and published by Namco.
I've been nagging Monkey J. Luffy to pick up "Tales of Symphonia" because I wanted to try it (he has GC, I don't). He finally got it, and I started a file and I have to say this game is one sick ride. I love the battle system and the characters and the plot is great (yet somewhat offensive).
Also, as a bonus, Monkey J. Luffy allowed me to borrow "Tales of Phantasia" for the GBA. ToP is a good game, but I feel like I'm playing Star Ocean 2 all over again. The main characters even look the same. Well, I like the time travel stuff, reminds me of Chrono trigger.
I was considering purchasing "Tales of Legendia" for the PS2 once I save enough money (it's still 50$ over here). I heard the battle system of Legendia has worse graphics that ToS and the battle system is set up like the old Tales games meet the new. I got enough games going on now, but I may get to it.
How are the other Tales games I left out (assumes there are a ton)?