Activision Blizzard owns some of the most popular games in internet history.
To name a few:
World of Warcraft,
Diablo,
Starcraft
Starcraft was released in the late 90's and is still a heavily popular game for Real Time Strategy enthusiasts. It is so popular in Korea that there are "Starcraft Celebrities" that get treated like rockstars in the U.S and huge competitions are celebrated annually.
Diablo Is another franchise that was released around 2000 (I don't have the specific date on my hands right now) and is still a popular game to this day.
A Diablo 3 preview was just released this year and its appeal is outstanding. I'm betting this will be another very successful game for Blizzard.
That's not the only thing new coming out, they're also releasing Starcraft 2, which will also be a mega-hit in my opinion.
Not to mention that their subscriber-based game, an MMORPG, World of Warcraft takes in millions of dollars a month from the $15 subscription for each account.
A World of Warcraft expansion is launching later this year which should boost their earnings just on the purchase of the expansion from the thousands of players that participate in the World of Warcraft.
There are also rumors of another MMORPG that will be announced at Blizzcon this year.
Overall, there are a ton of things being released by this company and all of them are sure-hitters due to the fan-base, and overall quality that is produced from this company.