It is a good idea to read/update AD information from SharePoint. Expand on your topic, it will be thrill to let Sharepoint users maintain their own profiles.
However, the sad thing is there are no OTB solutions to do that. May be it is viable suing code.
If are in urgent, take a look at <a href=”http://www.sharepointboost.com/ad-self-service.html”>Sharepoint AD Self Service</a>, which can do that in a state-of-the-art level.
Hope this helps.