Our mobile mashup Geo chat has been updated. HTML5 mobile web application lets you chat with people nearby. Anonymously, you do not need any special account. Just a text chat with people nearby (e.g., in the same café, in traffic jam etc.) Check out it from iPhone, Android, Samsung or Opera 10.1 mobile browser.
(it is a mobile site).
You can copy link right to your phone with QR-code above. Or use the following short URL http://bit.ly/gCbzm3.
You can use this chat in your own mobile web applications. The basic URL accepts the following optional parameters: lat - latitude for place
lng - longitude for place
for example: Palo Alto, University Avenue, Starbucks
There is the similar mobile mashup City chat - the dialogues there are connected to some place from Foursquare. Geo chat is almost the same but implemented for any geo place without the connection to some predefined place
Technically it is a web mashup that uses chat engine from Coldbeans.
As per similar "city-level" applications check out also City forums or City Guide
P.S. as per hyper-local chat see also WiFi chat application