UPDATE: I've topped this score. Check out my new personal best.
I make it a point not to brag or boast when I complete a video game or achieve a high score, but today I'm making an exception because I amazed myself with this achievement. While playing the Endless Standard mode of Tetris DS I racked up a score of 2,768,132 with over 1,160 lines completed with the game ending at Level 116. Incidentally, the game stops counting completed lines at 999, but since the classic games that scroll by on the top screen follow the same pattern each time through, ending the game on Excitebike as I did puts me somewhere in the range of an additional 160 lines past 999. Top that, my friends. Top that!