object collections

can anyone show me how object collections work? here's an example of what i mean:

collection.item.property = "gfsdfdsf"

i want the items to be of a custom data type.

here's a good tutorial that might help

thanks. it looks helpful. i'll see if i can make sense of it. now if you'll excuse me, it's already 10:34 pm--roughly 10 hours past my bedtime.