This article is from the the official alt.spleen FAQ, by Andrew Stellman with numerous contributions by others.
Andrew says: NOTE: PLEASE DO NOT SEND ANY MAIL TO ME REQUESTING MEDICAL ADVICE! I AM NOT A DOCTOR, AND WILL NOT GIVE YOU ANY USEFUL INFORMATION.
Rob Piltz (firstname.lastname@example.org) has this to say:
"While aluminum siding requires little maintenance after it has been installed, I still prefer the look of natural cedar shake siding. It may be more work, but I think that overall you will be pleased with it, you can stain it any color you like. Plus, your spleen will like it better. Natural wood feels more comfortable to your spleen than hard, cold aluminum. A comfortable spleen is a happy spleen."
It has been noted that aluminum siding chafes spleens. Dave Calvin notes that WD-40 reduces chafing, but reminds us that spleens don't like the taste of WD-40, which could result in a decrease in performance.