I got hooked on GTD a few years ago, and it's been a love hate relationship ever since. I love it for how productive it makes me feel and insights I've learned, and hate it because I hate myself for not being able to stick with it.
I tried a paper system, using both a planner and then a hipster PDA, but I just stopped picking it up. Then I try dozens of GTA apps, tracks, RTM, 5pm, Toduo, etc. I also tried a real PDA but it ended up in a closet drawer. I have had the most sucess with tracks, even installing it to my own server and making it my homepage, but still, I just wouldn't log in and everything became stale.
I am thinking of going to a dry erase board, that is hopefully in my face enough that I can't avoid it in my office, but I am worried that I just won't look in that direction after a while.
Perhaps there is a bigger issue that I can't identify. Does anyone else have the problem of falling on and off the GTD wagon?