I've no mite experience (luckily), but I will mention the other creepy crawlie that has paid a visit once or twice: mealie bugs! Another eww....
They can do more damage faster than most other critters in my experince. White and feathery, they're almost too small to see individually. If you spot a snow-white surface on a leaf or stem, take a high-res shot with your digital camera and zoom in. If you see legs or antennae, or anything that looks close - NEEM it!!! Neem is effective with mealies as well (the soap is merely used to emulsify the oil in a water-based spray.
It's quite cool that the Dartmouth Greenhouse has gone to a total program of biological pest control, and it's been very effective. Here's a like that describes it:
Of couse, I don't think I want to introduce any insects into my home...but it works for them.