Online sharable address book?

My wife and I use Google spreadsheets. It works really well for us and you can share it across multiple emails. It may not be as pretty as some other sites but it is simple, works on any O/S and unlike a lot of those companies I think Google might be around for a while.

I use Google Notebook for an contacts/address book. It also has sharing capabilities, though I am not sure how easy it is for the other person to use.

An update-once/enjoy-everywhere address book has been something of a holy Grail for me for years. The closest I've come is the Mac's Address Book plus .Mac syncing. .Mac is a terrible deal for the money, but the syncing "just works" and I've found no viable alternatives. Of course, I'm speaking from a single user/multiple computer perspective, and you're looking for a multiple user solution. I think Address Book does sharing, but maybe only over a local network. Have you considered rolling your own LDAP server? (kidding) I'll second the recommendation for Highrise. Though I've never used it, I hear it's nice.

Oddly enough, I just ran across http://www.fromconcentratesoftware.com/Share/ today, which might work for you.

plaxo? they recently integrated one of their widgets into os x's address book: http://blog.wired.com/monkeybites/2008/01/new-plaxo-widge.html admittedly, i don't use it, and there are may be some... concerns about their privacy policy but i haven't looked far enough into it.

Thanks for everyone's suggestions. Still looking for the perfect solution, so I'd love to hear more suggestions, too. So far Google Spreadsheets may be the most workable answer -- but I'm hoping to find something with built-in addressbook features. (Some of the ones mentioned, like Highrise etc., are good but a bit clunky or not as configurable as I'm hoping.) To the person using Google Notebook: Do you create a new notebook for each entry? Or just type each entry as a line in one notebook?

Sounds like Plaxo is definitly your thing.

I'll echo the Google's Spreadsheets suggestion. I use SS for just about any kind of database I can think of (DVD's I own or want, books and so forth). It's perfect as a contacts manager because you can create whichever fields serve you best and you're not stuck with field limitations that product designers think are best for you. You can search fields, sort fields and so forth. However if that's still not satisfactory, you might consider a (private) family wiki. You can use http://www.wikimatrix.org/ or http://en.wikipedia.org/wiki/Comparison_of_wiki_software to compare various features of wikis.

Some sort of LDAP server would work too. Though, i'm not sure how to go about setting one up.