Check out this blog post by Aaron Mahnke. In it, he talks about how he writes a novel. I thought the tips were just as applicable to writing music. I really like the idea of removing friction. If you have to launch 3 apps, plug a bunch of stuff in, and spend minutes configuring everything, many times you'll just say "forget it, what's on tv?" That's one of the reasons I like Reason - you have everything you need to get 'er done. You don't have to plug anything in or even turn anything - just open the lid of the laptop or wake your computer from sleep. In fact, Reason is always running on my laptop, just in case I have a random idea.
With Reason 5, I like to use the on screen keyboard if I am out and about. It turns the keys of your laptop into a mini keyboard. It's not touch sensitive (obviously), and you really only get about 1 1/2 octaves, but it works in a pinch.
Another thing I like to do is always keep an acoustic guitar out, whether hanging on the wall or on a stand. Now, I am by no means an accomplished guitarist, but for some reason it's easy to walk by, pick it up and bang out a few chords if I have a spare minute or two. Sometimes, it will even spark a musical idea.
Along the same lines, you can keep your ewi out of its case just lying on your desk ready to go for when inspiration strikes.
Do you have any tips for removing friction in your musical endeavors?