1. World of Warcraft - GameOgre Review

World of Warcraft - GameOgre Review

The best online game today that you have to pay for with over 10 million subscribers. The entire MMO industry has reach huge heights of popularity thanks in large part to World of Warcraft.

2. Counter-Strike: Source

Counter-Strike: Source

Better graphics and technology continue to drive the popularity of this vaunted first person shooter. Tops the original CS in nearly every way except Steam. Although it started out as a mod to Half-Life, Counter-Strike has developed into one of the greatest Internet games ever.

3. Guild Wars - GameOgre Review

Guild Wars - GameOgre Review

Simply the best Free MMORPG today. Not quite as good as World of WarCraft game-play wise, but Guild Wars' lack of a subscription put its over the top in this category.

4. Team Fortress 2

Team Fortress 2

Innovated the shooter genre with cartoonish graphics and outrageous characters. Best of all, online game play is free.

5. RuneScape

RuneScape

RuneScape is proof that graphics are not required to be popular. RS has been drawing in players for years with simple graphics as it continues to be a leader among free MMORPGs.

6. Second Life

Second Life

Love it or hate it, there is no denying the overall impact that Second Life has had on media, business, and even culture. SL has made people millionaires and has appeared on various TV shows such as The Office.

7. StarCraft

StarCraft

Ever wonder where the term "Zerg" comes from? StarCraft started that term has been extremely popular ever since. The sequel will probably be even more popular when it is finally launched.

6) Second Life