Virtual + real calling
Vodafone ('InsideOut') enables voice calling on and off Second Life. Telecom Italia's Second Life service is limited to on-net calling (between avatars). This functionality may spread, as Linden Lab is working on interoperability with IBM, in order to allow avatars to move into other virtual worlds.
Internet + mobile IM
Billed as micro-blogging service or as a Twitter look-alike, Jaiku is the newest Google annex. It extends into the mobile realm.
Email to SMS/IM
The latest Yahoo! Mail version added the possibility of sending messages to mobile phones (as an SMS) or to an IM service (Yahoo! or Live).
SMS + LBS
KPN launched olllo (with Heineken and MTV for advertising), a flirting service. It uses both SMS (for communication) and the callers' positions on the network (to find a victim) and obviously goes a little bit further than Sprint's 'friend finding' service, which uses GPS (so the pin-pointing is better, but it takes a GPS-enabled handset).
UPDATE (Oct. 11):
Of course I could have included SMS services from Google:
- In September, it applied for a patent related to paying by SMS (Safaricom of Kenya apparently also has a payment system based on SMS, as does KPN-subsidiary Base).
- Yesterday it launched Google SMS (queries by SMS for local info) in India.