I've just started using Pinterest. If you haven't heard of it, this is how its creators describe it:
"Think of Pinterest as a virtual pinboard — a place where you can create collections of things you love and 'follow' collections created by people with great taste."
Basically, it's a really nifty way of keeping all those images that you come across online, in one place – perfect for creating housey mood boards, grouping photography ideas, picking out style inspirations etc. And, when you use the 'Pin it' bookmark to grab an image from a website, it automatically grabs the source link as well, so you can credit the original creator.
I recommend it – it's easy and fun to use (and really rather addictive!).
Here are a couple of folders I've set up – Home ideas and Foodie photos: