I've a similar question and was interested in answers, but absent any I'll share what little I know.
We are looking for a chat solution as well. The current lead candidate appears to be 'Campfire' from 37signals.
http://campfirenow.com
- Campfire is a web-based group chat tool that lets you set up password-protected chat rooms. Invite a client, colleague, or vendor to chat. Link to a room on your intranet for internal communications.
- web based, nothing to download or install
- free for up to four chatters on-line simultaneously, various paid plans
- iPhone, iPad, Android apps exist
Testing with the free trial will have to wait until after the holiday weekend.