I knew someone would ask eventually. The entire basement floor plan was drawn with 3D Home Architect 4.0 published by Broderbund. There are other similar packages out there, and I won't turn this into a CAD review thread, but I will warn against buying the 3DHA 5.0 version. The real upgrade path from 3DHA 4.0 is here.

M60/VP150/QS8/M2/EP500 Harman Kardon AVR-7300 Panasonic AE700U/DVD-S97 Sony DVP-CX985V