The project I've been working on for over a month isn't complete yet (that'll be another week or two), but it's finally reached the point where it does something more than sitting there and looking pretty. (Although it's not bad at the looking pretty thing either)
All the pieces finally fit together, and it did what it was supposed to without crashing. Now I just have to do the rest of it, and test it into the ground...
(That's about 7KLOC of Java, 1KLOC of C++, and -3KLOC Java, and maybe a month and a half of work, for reference. Yes, I'm counting my negative-KLOC.)