If you find any interesting Touhou videos, feel free to post them here (I'm pretty sure that we've all heard Marisa Stole the Precious Thing, so no need to post that, unless you really want to). Anyways, I'll start with 4.
http://www.youtube.com/watch?v=kPilJCvwKok Convenient to have a maid, huh?
http://www.youtube.com/watch?v=QXjeA9ZqAUs Watch to the end, and you'll see Kaguya "exposed".
http://www.youtube.com/watch?v=xvSz567yPvQ Mokou's story before coming to Gensokyo
http://www.youtube.com/watch?v=ZDYPlSrRb18 Sakuya gets a job at "Reimu Burger".