Real Players Do It Passively

Check out PMOG (Passive Multiplayer Online Game).

Recipe:
-a dash of roleplaying
-a pinch of whimsy
-a touch of free time
-a lot of fun!

It's a game that you can play whenever you're online, regardless of what you're doing.

How does it work? By surfing the web, that's how!

You have to rack up points to buy mines and all the other stuff that makes the site fun. Every unique domain that you visit gives you two points, so you get points just from surfing the web. You can also give gifts of mines and other tools to others by leaving “crates” around...

Gathering points and completing missions leads you to higher levels, where you eventually choose a character type. There are six characters in all - two are “chaotic” and leave a lot of mines and portals. The rest follow the “torch of order” and focus on protecting others or creating useful missions.

One note - you do need to use the Firefox web browser (another great reason to switch).