Getting mailbox sizes via script

Back in May, an attendee at one of my webcasts asked if I could point her to a script for querying mailbox sizes on a set of Exchange servers. I flagged her message to remind me to answer it and (drum roll) am just now getting to that folder of flagged items.
So, the answer is: you can start with this script from Michael B. Smith; it will give you the mailbox size information without touching the last login date on the mailbox. It doesn’t constrain output to a range of dates, but that should be a fairly simple addition.