When you move into a new place - whether starting a new lease or making a purchase - it invariably seems the windows could use a good washing. It's a detail we are always eager to address once the interior of the home is reasonably set up.
We're always so excited to get around to washing the windows because it always represents a turning point for us in feeling at home. It also has a huge impact on the "polish" of a space, allowing surprisingly more light and clearer views than you've seen before in your new home.
If you're reaching the point where you have your unpacking and interior projects under control, consider turning next to the windows. Here are some tips from our archive to get you started:
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The Big Book of Small, Cool Spaces 
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The Eight-Step Home Cure 
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Summer Recipe: Gluten-Free & Vegan Strawberry Shortcake
I never understand this phenomenon of dirty windows everywhere new I move, I always clean them before I leave- helps sell a house, and when renting, makes the landlord think it's cleaner on move-out :)
Oh man I wish the previous owners cleaned the windows before we moved in. Cleaning windows is definitely on my to-do list. There's so many of them though, one of these days..and then it will make the outside dirtiness that much more evident.
I'm with Nephthys - I really need to get around to cleaning my windows, after all, we only moved in two years ago...ahem.