I used green "Frog" tape on the last house I painted the interior on (our rental). It was ridiculously expensive but it worked REALLY well. This house has light beige walls, white ceiling and white baseboard/woodwork. On this paint job, I did try to do more work without tape. In alot of places, I did a really terrific job, it looks like a pro did it. Other places, well, let's just say I spent far more time cleaning up my mistakes than I would have ever spent taping it off...
Tape is the friend of the infrequent painter.
angela