Whenever you start a new company there seem the be the same infrastructure problems: mail, calendar and address management.
I consider mail and calendar almost a “solved problem” now with Zimbra and Google Apps (we’re using the latter at Nektoon and used Zimbra at local.ch).
But proper contact handling is still hard. Google Apps strangely enough doesn’t seem to include shared contacts. There is of course Lotus Notes, MS Exchange and again Zimbra. But somehow I was never quite happy with Zimbra’s address management. Additionally - me being a geek - I’d really like LDAP access to my addresses. This allows for all kinds of great integrations.
So after some digging I finally came across ConTagged. It’s very simple but user-friendly. Integrated Google Maps, tagging, auto-completion of various fields such as company and tags and good search.
I had some small issues setting it up - but we are now using it and so far happy about the choice. A killer feature for me is that I can auto-complete mail addresses from our shared contacts database in Apple Mail.