Find a time to write and write. One hour a day is fine. I write every morning.
Find someone to become accountable to. I will restart the 'number of pages written' thread in Author Craft. It dropped off. Or use #amwriting on twitter. Both can give you a sense that you are NOT ALONE at your laptop.
Take a writing class. Try mediabistro.com. You'll be forced to come up with 10 pages every week, plus you'll crit 15 of your fellow writer's work of 10 pages each. That'll keep you focused.
Edit the words or scene you wrote the day before, then move into fresh scene.
Play white noise or listen to zen type music that masks city sounds, then fades as you write. I 'awoke' from my best and longest writing session to find myself listening to the DVD episode selection music for Gray's Anatomy. I write with old tv series on the screen. Old stuff--so you aren't riveted to it.
There are a lot of good ideas out there. Find one or rotate lots of them. Anything that jiggles the writing genes helps.
Good luck and happy writing.
Love your characters. Make them your friends, although you'll need to kill some of them off..so make it a prostitute relationship. LOL
There are also a lot of google sites you can explore, but this one tickled my own creative muse.
http://clicks.robertgenn.com/find-your-muse.php Now, I'm off to strip and then eat some extra gorgeous raspberries. You'll never know if I'm serious or not. LOL