Which is the same reason today's strip is late. Shall I give you the long boring explanation, or shall we just go with "very sorry, not likely to happen again?"
Filk-sings are fan-code for present-day folk song, often based on modern science or science fiction. This one is based on Star Trek: Voyager, and I still like it. We don't get to see the guys just relaxing and being fans often enough.
Shanna's monologue, like Kath's "illuminated manuscript," was a way of introducing readers to a new issue of the comic book while providing a fresh perspective for the readers who were rejoining us. Some of those new readers might have been confused about Shanna's employment—she is employed, but doesn't have great prospects for getting a better job anywhere else. And she needs the money.
Qi'kkit is pronounced "cricket" if you know Klingonese, "kick it" if you don't. Just covering the bases.
Oh, man, he's PULLING HER HAIR. He might as well call her a boogerbrain, too. I swear we didn't know these two would get together...