I am in the same boat really. The key I have found is name recognition and reputation. There is really no path to feature films but feature films. So you either have to start at the bottom and work your way up or you have to make a name for yourself and know who is who. If your like me your probably just trying to find a way to make money doing what you love while you build your skills to get to feature films. It can be done if you have a strategic plan of where you want to go and what it takes to get there. I got my first credit on a Feature Film for Outlaw Films (Training Day, Sex Lies and Video Tape) 11 months after my first short and I have been on over 90 productions in 15 months. It's paid off with skill and resources. That's the best marketing for the industry I have found. For getting paid that's just business marketing I am afraid and it's a highly over saturated market. But as a wise producer once told me "Anything that is good will eventually rise to the top". I have found that to be true.

Use celtx all the time, when I send off scripts I always send two versions, celtx and pdf files as it's easy to convert, also most agents/distributors insist on receiving scripts by email ? not always but mostly