Socialtext announced yesterday that they’re giving free access to their wiki and associated tools (blogging, micro-messaging, spreadsheet, etc.) for up to 50 people:

A free, hosted Socialtext account for up to 50 people from your company. It is private between co-workers. You and your colleagues get private, “Twitter‑like” micro‑blogging, social networking, and a shared wiki workspace.

Good way to get teams started, and once you hit 50 people, that’s a good indication that it’s worthwhile to invest the money and further grow adoption throughout your organization.