Steam and their sales is a major source for indie games. gog.com has also started selling indie games.
Otherwise bundles like humblebundle.com, indiegala.com and indieroyale.com are a good source for indie games.
Lastly I hear about the latest indie games from my co-students at the university. After all we are studying games, so I'm constantly informed about the next big thing in games.
Edit:
And of course kickstarter is a dangerous place to browse, if you don't wanna spend a few bucks. I just ended up backing this project: http://www.kickstarter.com/projects/...the-universe-0
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