Looking for an online web-based game to soak up some “spare” hours?
Like Civilization?
Like Turn-Based Strategy games?

Go check out Vox Imperium, it’s an interesting mix of the above.

There’s no turns, as such – but resource gathering and building only occurs at each “Pulse” (which occurs every 30 minutes).
You’re free to build/move units between pulses as your resources allow.

Because of the slow pace of the pulses, it’s quite possible to spend a few minutes every night (or two) moving units around, building, etc.
It’s only when you move into latter stages (which I havn’t reached yet) that you’d need to spend more time as you struggle to capture territory and strain your resources.

There’s plenty of room for improvements (A lot of people have suggested Google-like map browsing, which the developer is working on), but it’s quite playable at the moment.