haha thanks, guys. If I were more of an emoticon user, I'd have selected the blush icon by now. I really appreciate it.
@amph: My humidity varies a bit more than some of the other set-ups people describe. I don't let my humidifier run at night - save the 15 minute intervals that occur three times throughout the night - and keep the window directly behind the rack open, so the humidity tends stay in the 60% to 70% range (although it will drop lower if it's colder outside). To give you an idea, today my hygrometer shows the max humidity was 93% (which likely occurred while the humidifier was on during one of the 15 minute night-time intervals, so is more or less irrelevant) and the low 62% (this figure is usually in the mid 50s).
Due to this fluctuation, my plants are never wet for prolonged periods of time and are therefore not affected by mold (with the exception of the odd bit growing on an old pitcher that has been producing too much nectar around its peristome (but even this rarely happens)). When I was originally trying to figure out the ideal timings for the humidifier, I set it to turn on for three hours straight during the night and there were signs of mold growth. Most gardeners know not to water plants before sunset, so it wasn't much of a surprise.
Let me know if I've elucidated this well enough, since I tend to explain things better in the morning.