The trick of writing is often to simply trick yourself into writing. Two things that can work well: 1. Tell yourself you'll try for 10 minutes, and if it's not working, you'll stop. 2. Leave the desk, take the laptop, and head to a cafe. Hava Java being the prime spot around here. No time limits (handy even if you start out believing you'll just need 10 minutes), great music, cool staff. (Also a good spot to hang out if you need your passport photo verified, as you are guaranteed to see some lawyers you know. Also works well for casting plays, short films.)

(Image: farm4static.flickr.)