I do think it is interesting how different the sales of GTA 4 has been, the games last gen had good openings but were really more about selling for a long period of time. According to the charts GTA4 sold about 10 million in the first 10 weeks, and has sold about 3 million more in the 60 weeks since. Like Lostplanet said GTA SA was still in the top 200 recently, and for the week ending the 29th still sold 4.5k worldwide on PS2, only about 10k less than GTA4 on the 360&PS3. As outlawauron said maybe the greatest hits/platinum hits release will spark some more sales, but as of now it looks like GTA 4 will wind up significantly lower than San Andreas, and probably lower than Vice City.