So far, GrandpaTellMe.com sounds like a great tool - is there more?

More Features:

• Keep a Group Calendar.
  The calendar tool makes it easy to record birthdays, anniversaries, upcoming reunions and any other dates that you would like to share with your group.

• Share Files of Any Type.
  The "Files" area allows you to upload any type of file including GEDCOM, PDF, EXE or any other file you would like to share with your group.  Just include a description so that people will know what it is.

• Members / Profiles.
  The "Profile" section allows you to enter optional personal information to be shared with your group.  It also provides access to personal preference settings.  The "Members" section allows you to invite new members and to browse public profile information of the current members of your group.