There is a wonderful site for Revit Family knowledge: skills for Revit family creation or edition. The site link is: http://www.revitcad.com/. However, the language of this site is Chinese, you may be difficult to read it, anyway, we can get help from google translate: http://translate.google.com/. You will find many very useful experiences there, some of them may be you never think about 
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Revit auto dimension app will help you add dimensions to all pipe, duct, cable tray and conduit elements in current view by only one step. Let you free from tedious work for adding dimensions.
The link is: http://en.revitapp.com/auto_dimensions.html
For Revit2011, we will find that Revit API was changed a lot, many interfaces, namespaces were changed. Apps based on old Revit API needs to be modified to work on Revit 2011. However, many new functionalities were added into the new API including some new Ribbon APIs (eg. add customer ribbon button). With the new API, we can do much more than before. Let’s enjoy it.
Welcome to RevitAPP.com. Hope you can find the most valuable information here for you.
