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I'd like to add to this as well, since this also seems to be a common problem... In my idle time, I've been skimming through the book, First Draft in 30 Days, by Karen Weisner. It's REALLY useful in outlining a structure of a novel, and breaking it down so it's easy to remember. She also included this really nifty list of the things she does to overcome Writer's Block. Here's a general idea:

HOW TO OVERCOME WRITER'S BLOCK
Ideas taken from Karen Weisner's First Draft in 30 Days. Items marked with a * were not.

1.) Read a book or watch a movie in the same genre as your current project to create a springboard for your brainstorming
2.) Make a soundtrack of your current project; choose sings that fit specific parts of your story
3.) Take long, slow, and scenic drives alone. (Of course, if you don't drive, just take the time to stare out the window and ponder)
4.) Take a long, slow, and scenic walk alone. Enjoy nature and the particular season
*5.) Talk with your characters. Yes, that's right. Do it when you're alone if you must, and just imagine what they'd say. It helps greatly with characterization
6.) Go shopping. Buy yourself something your main character would like, or holds dear, like a special pendant or bracelet
7.) Get out of the house -- go anywhere -- and people watch. Observe things around you
9.) Ask yourself "what if?" questions about your plot and characters
10.) Try throwing unique ideas in your plot to see where they might lead
11.) Take a nap. You can be at your most creative state between twilight and sleep. (*) Draw inspiration from any dreams you might remember
12.) Talk to anyone who'll listen to you about your story. You can get a variety if different angles and perspectives you probably never thought of
13.) Collect magazines and cut out pictures of people and settings that resemble those in your story
14.) Write with a partner on separate projects. Of course, don't plagiarize, but always think to yourself what's interesting in a story that's not yours
15.) Write a letter to one of your characters... (I prefer just to talk to them, but eh...whatever floats your boat. XD)
16.) Seclude yourself. At times, some of the best ideas come from you, and you alone
17.) Make yourself a cup of hot coffee, tea, or chocolate
18.) If you're writing on computer, try writing with paper and pen instead, or vice versa.
19.) List your main character's areas of interest and do something creative in that area
20.) Interview someone in a career shared by one of your characters
21.) Exercise while listening to your soundtrack (Hmm...build a strong body AND a strong story at the same time....I like this. XD)
22.) If you can help it, try visiting a setting in your story, or a place similar to it
23.) Establish a special room or area where you're free of distractions
*24.) Listen to the weather. Rain, hail, sleet, shine, or wind.
25.) Go outside, and just lit on your back on the ground. Take it easy.
26.) JUST START WRITING. Don't worry about where you're going, how it sounds, or your word choice. Write as it comes to your mind; you can go back later