that on 07-Jul-09 it will discontinue the .Mac HomePage Web application as a method for adding and editing content on .Mac-hosted Web pages. HomePage is a legacy feature of the .Mac service that enables users to publish simple Web pages using their .Mac account; old versions of iPhoto also created photo albums that could be edited via HomePage.
While all .Mac Web pages will remain accessible at their current URLs (as long as you maintain an active MobileMe membership), they will become unmodifiable via the HomePage Web application after 07-Jul-09. However, you will still be able to modify HTML files in your iDisk's Sites folder. Plus, if you want to remove any content after 07-Jul-09, you'll have to delete the files manually from your iDisk, since the HomePage Web app will disappear.
In lieu of HomePage, Apple recommends that existing MobileMe users use iWeb (included with iLife '06 and later versions) to publish new pages to their MobileMe accounts. Additionally, MobileMe members may use iPhoto or iMovie to publish photos and movies directly to MobileMe Gallery. Instructions for migrating HomePage and  to MobileMe Gallery can be found on Apple's Web site.
Finally, while Apple has not officially confirmed it, some users posting on Apple forums say that Apple support techs have indicated that HTML pages published via .Mac and made using tools other than HomePage or iWeb will continue to work via their current URLs.