Some more:

http://vgchartz.com/games/index.php?name=SaGa&console=&publisher=&genre=&keyword=&order=Last+Updated

Xenosaga Ep.1 duplicates. The one that uses the roman numeral is correct, but the duplicate actually has sales data (just for Japan) versus the proper one which has none at all. Go figure.
Also, all three Xenosagas are missing their subtitles.

Romancing SaGa: Minstrel Song (PS2) has a duplicate that's misspelled as "Ministeral Song." Going by naming conventions, the real title should have the subtitle removed since it was removed from the US title, considering that the original hadn't been released here. Also, Romancing SaGa and Unlimited SaGa don't have the G capitalized like the rest of the games in the series as they should.

guitar here 2 is there twice, don't know if it be that way or not

http://vgchartz.com/worldtotals.php?name=guitar+hero&console=&publisher=&sort=Total

It's nice to see you taking care of this stuff SSJ12, I know its really frustrating to see games that don't have later regions updated for them so we can't see how much they've really sold.

Tomb raider legend and forza 2 have duplicates in the database :p

 so would I

Great idea ssj12. I've often deleted duplicate games, but I'd never thought to make a thread about it.

echoing others, my biggest concern is duplicate games that each contain a section of sales data. I'd imagine ioi has the ability to merge or transfer sales data?

 he knows, he just needs time.

hey if you guys are gonna talk to ioi, might I make another suggestion. Games that have 'versions' should have their boxarts and names listed under ONE title. So like, oblivion, oblivion GOTY, that's 2 releases for one title, it should be specified under one sales data title so we know the history. Others include fable and the fable lost tales thing, ninja gaiden/ninja gaiden black, and apparently bioshock will also get something similar next year.

One interesting one on 360 is marvel ultimate alliance which has like 3 versions on the console out or coming. Stuff like final fantasy 11 also.

 Ps2 had some too like metal gear 2/3 subtance versions and devil may cry 3 SE    

http://vgchartz.com/games/index.php?name=Seiken+Densetsu&console=&publisher=&genre=&keyword=&order=Last+Updated

Holy Shit, someone raped the name of this game.

There is no "Seiken Densetsu: Final Fantasy Mystic Quest." Those are two different games on two different platforms. This is exactly what I was talking about when it came to Seike nDensetsu games having their names raped in the database. The title for the game should be Final Fantasy Adventure for the US version and Seiken Densetsu for the Japanese. I also noticed that Heroes of Mana and Children of Mana's titles are STILL wrong after providing them here before...

And there's a Secret of Mana duplicate too.

I suggest that the names should adhere to a scrict format. That way, we can limit the number of duplicates and the need to regularily check for inconsistencies.