For philosophy stuff, I always go to the Stanford Encyclopedia of Philosophy. Writing a SEP entry is considered quite prestigious, so they generally get some of the very best people in a given field. The SEP tends to be much more reliable than Wikipedia, though it's also often more technical. SEP articles generally concentrate on giving you a survey of the positions on a topic, along with arguments for each. The best ones are written dialectically, giving you some sense of the questions guiding the development of people's views.
There have been a couple discussion posts on this, but let's make it general and collect our tips in one place. It's also a good way to encourage each other at getting better at this - looking for info more often and more efficiently.
So, if you want to find something out, where do you look, and how? Who do you ask?