One of the launch showcase applications for the new Google Apps Engine is HuddleChat. If you’ve ever used 37signals’ Campfire, HuddleChat is easy to understand: it has exactly the same feature set. You get ad-hoc web-based chatting with persistent transcripts, file upload and storage, and even special formatting for source code pastes. You also get integrated login with your Google account.
The only thing missing in the attempt to clone Campfire is the price: HuddleChat is free for any number of users, while Campfire charges you if you want more than 4 people in a room. If you need a quick place to meet up with colleagues for a talk on the web, without the hassle of figuring out what the common IM software is for the group or the challenges of dealing with IRC, HuddleChat is now the cheapest way to go.