for me there have been two components to building regular practice. first is the 'just do it' factor, you have to make a serious commitment to yourself that you are going to sit, for at least a little bit, no matter what. even if nothing productive comes of the meditation, it still serves to reenforce the commitment.
the other, and most important part imo, is making meditation ENJOYABLE! Meditation should be fun, enjoyable, pleasurable... if you view meditation as a chore or a duty, its unlikely anything worthwhile will ever come of it. For me approaching the practice with an attitude of exploration/investigation/wonder is very motivating... It's interesting, like being a mind scientist. Also it feels good, getting the mind into a concentrated state feels extremely pleasurable and the Buddha said this pleasure is good and to be pursued. That is one thing that I am so thankful to Thanissaro Bhikkhu for... he really emphasizes that meditation should be pleasurable and the desiring the non-wordly pleasure of Samadhi is good. The idea being that our unliberated minds will automatically follow pleasurable feelings, so if we can get our minds to follow the pleasure that comes from meditation its like a loophole and can REALLY turn out commitment to practice from a burden into something we enjoy and desire... we can use our unskillful desire for pleasure in a skillful way.
i also do a lot of reading/listening on meditation, theory, practice and on various subject by the great meditation Masters. i like to listen to a Dhamma talk before meditation, even if just for a minute or so... i find this really helps to bring up the correct mindstate & inspires me to practice.
"It's easy for us to connect with what's wrong with us... and not so easy to feel into, or to allow us, to connect with what's right and what's good in us."