Also, for interesting and creative ideas, it is very worthwile having a long and hard look at the paper and videos from the latest Velomobile Seminar, held in Copenhagen in October '09.
http://liggecykelforeningen.dk/Designseminar/Proceedings
There is so much interesting stuff there. Don't miss the video with Harald Winkler throwing his 1.2kg fairing straight down on the floor to demonstrate its durability.