Apple has begun sending an email to MobileMe customers about a pending service change. Specifically, .Mac HomePage will be discontinued on July 7, 2009. While existing pages will remain live at their current addresses for MobileMe users, they'll no longer be able to edit them or add new ones. If you want to delete an existing page between now and then, simply visit the HomePage application.
Groups will also be discontinued on July 7 when Apple shuts down all group email address, group HomePages, message boards and iDisk "Groups" folders. Your data will be safe, however, as Apple will move the "Groups" folder to a new folder on your iDisk called "Groups Archive."
While I never used Groups, it's kind of sad to see HomePage go. I can remember building homepages on my old 333mhz G3 iMac. It was so easy to make a quick-and-dirty site for sharing photos, etc. with grandma. No, it wasn't the cleanest code ever produced, but it was fun back in the day.
Of course, Apple recommends that customers consider MobileMe Galleries and iWeb as an alternative. You can get the full run-down here.