It’s now possible to query the Swiss phone book of search.ch with Jabber instant messenger. Add tel.search.ch@swissjabber.ch to your contact list and send him a message containing just the name and location of the person you’re looking for.
I have now added this to my Adium client and it works fine. What’s missing is looking up the name for a phone number. And the output doesn’t format the phone number very nicely.
(Via 2ni, search.ch CTO)