Do you use multiple calendars in Gmail, Exchange, or elsewhere?

My work makes use of multiple google calendars which it would be great to have collated along with my personal outlook in one place.

Honestly, I can't see how you can use multiple calendars... You have only one timeslot and it makes sense to put things in one calendar so you can tell if you're free at a glance. Not several glances and some mental juggling. Admittedly, the pre's aim is to eliminate just that. The only scenario I can imagine for multiple calendars is if you have your calendars shared and want to keep specific appointments within specific circles (I doubt you would want your colleagues at work to know that you have a 6oClock appointment with your doctor while you'd certainly want your wife to...). I dunno how often that arises.

Another scenario is if you have calendars forced upon you. For example, if they are 'group calendars' and not ones which you actually control or even 'own'. A lot of these, though, fall under the first category.

Does this occur often enough to justify the Pre's capabilities? I don't think so... but it may help a few. Perhaps more than enough to justify the effort that went into coding and testing it all...

Multiple calendar support is absolutely essential to me. I keep a calendar, my wife and kids each keep their own calendars, and one extra for birthday/anniversaries/holidays. Many times I need to know more than one of our schedules to make an appointment. If a phone can't support multiple calendars, it's not even a consideration for me.

It's a great feature. At work we use google calendar and i also have my private one. It's a good thing to have them in one place:)
And i can't resist an impression that it's another post intending to suggest that features winmo lacks aren't that great. Even when it's obvious they are:) Keep on patting yourself on the back;p

It's very useful for me. Use it at Google Calendars.
I have 17 of them.
Each for different type of activity.
Makes it easier to search, plan. (They all have different colors)
There are calendars I don't share with some people and some I share only with certain people.
Esential for easy planing.