Tip #11 is from BriCenter S.A., announcing the availability of their second public bet version of their MeetingPoint product:

"...MeetingPoint, is a multi-platform (*) bluetooth contacting application.

Its main purpose is to help people find each other in mobile situations or on crowded public places, even when it's the first time they meet.  Just tune your MeetingPoint to a previously agreed channel and it will fire an audible alarm when both parties are within bluetooth working range.

MAJOR UPDATE - This version supports more PDA/phones and implements (**) a new messaging mode.  Now it's able to send messages to devices not running MeetingPoint.

(*) currently: Symbian, PocketPC 2003, PalmOS, PC/Windows.
(**) PC and PocketPC. Symbian partially. PalmOS in a few weeks.

Some extra information:  (from the web site)

MeetingPoint follows the CB-style paradigm of channels, where people on the same channel are able to send messages to each other.

It's useful for:

- Arranging a meeting with someone you don't know in person (e.g. virtual friends from a chat room). Just tune your MeetingPoint to a previously agreed channel, and go to the meeting point (airport, crowded pub, etc). When you are within range, both MeetingPoints will fire audible alarms,
making you aware of the other party's location.

- Contacting like-minded people, or pals sharing your interests, religion or preferences.

- Mass-sending a message to everybody within range, not just MeetingPoint users.