I meant to write this the day after I wrote about the Electrical Productivity Pack post but got side tracked. Jake Boen shared some of his cleverness with a Autodesk University lab I did a few years ago. For that session he created families that provided calculations that don't necessarily derive their results from actual model information, using annotation symbol families.
He decided to make some of these things (calculation minded solutions) available commercially on his new site BIM Productivity.
Some of his offerings are:
Point to Point Fault Calculation
Mechanical Ventilation per 2006 IMC
IECC Allowable Watts per Square foot
IBC 2006 Minimum Plumbing Facilities
IBC 2006 Area Modifications
Check them out!