My chapter has an alumnae website. One of my sisters is a web designer, and she's put together a great site. She posts an article about once a month, and alums and actives can post contact info, birthdays, and news updates. She even hosts it on her own server (geek
). The site is password protected, so I can't share it with you.
If you don't need all those bells and whistles, a Yahoo group might be just the thing. If you're going to post contact information, be sure it's password protected.