For those of you who have updated to Froyo and use an Exchange account you may have noticed that there is only one calendar now and the Exchange calendar is treated the same as an additional Google calendar. If anyone has found a way to split them up again, especially the widget, I would love to hear it as my search has been fruitless thus far.
I thought I would go ahead and put in a feature request with Google now since it can take them awhile to respond. I've requested that there be the option to create views as this would allow people to pick how they would like the calendar displayed. If this is something that interests you, please head over and star it to help get Google's attention.
Issue 9285 - android - In Calendar 2.2 (Froyo), add custom views for Calendar and Widget (separate Corporate and Personal) - Project Hosting on Google Code
I would love to hear anyone's optional work around as well.