This looks really interesting, I may whip up a few to try out as well!
Also, being a sciency type, you mentioned drying them out in the sun on the window sill? I don't know if anyone has mentioned this (I tried reading all 28 pages but it was getting a bit epic at about 18) glass filters out UV rays, you need direct sunlight if you want decent UV exposure, also the ozone filters UVC waves (the strongest type of UV) I don't know if these would be the type that are used in the lab to kill bacteria but there are lots of bacteria that live happily outside in the sun so... I shall do some research if that would be useful
I did read an article about a school in Africa (I think it was somewhere in North Africa) that left bottles of water out in the sun to sterilise the water to make it drinkable, I don't know if it was JUST the sun, or the combination of the sun and the plastic bottles that did it. Anywho this requires greater research!
edit: UV kills bacteria by messing up it's DNA I quote from WikiAnswers "UV light waves are of high energy, and can break the bonds in DNA, causing problems including death"<--- well I suppose death is a problem... this is the same reason why everyone should wear sun cream including people who tan and have dark skin, it messes with your DNA and gives you wrinkles no matter what your skin tone! If getting cancer doesn't put you off, think of the wrinkles!! Anyway this is completely off topic, I found that germicidal UV lights that you can by emit UVC waves, so sorry the UV from the sun just isn't going to cut it!