My primary motivator is the cool stuff I want to do in an LD! I have 2, perhaps 3 things max that I am super amped about making happen in an LD. Stuff that I know I am just going to fight like crazy to get done once a dream starts! Right now, I want to complete the Angel Falls Task of the Year so bad that I can taste it. Next, I want to find the note that I left for myself for Advanced Task of the Month. And finally, I want to do the gladiator fight Task of the Year. I imagine doing this stuff for MILD, get excited about it during the day, and motivate the crap out of myself thinking about it.
Thanks, I'll definitely put this into better practice. I definitely have a handful of things I really want to do, I'll have to focus on a few and just get myself super excited about completing them.

I'm getting all pumped right now! Damn!!
Hahaha! You had me pumped by the end of that too!

More concretely, I find participating in the Task of the Month really motivating. I like that feeling of working toward something that a bunch of other lucid dreamers are all thinking about, borrowing ideas, and sharing thoughts on how to get a certain task done. For me, this is hugely motivating. (And I did these when I was quite new... if you are ever super bored and looking for a laugh, watching how I flailed and failed at September Task of the Month 2012 might be mildly amusing.)
I have definitely been intending to complete a totm, I'll have to start participating in the threads to keep myself excited

I like to have my "lucid aids" scheduled throughout the week so I can get all excited
Oh I really like this, I'll have to do that.

And I don't know whether this helps or not, but keep in mind that your success motivates me and your other peers as well. When you journal up alucid dream, I read that and think, "Hey! I want me one of those too!" Experiencing a victory is awesome. Sharing a victory is that little bit sweeter.
It actually does help CL, thanks a lot.