Enterprise wiki's are great because:
- They center work on a topic around a group of webpages
- They are easy to use. Socialtext is just a double click on a page
- They open up information to the entire organization through simple searches
- Information entered into them for the benefit of the project group is immediately also of benefit to others. So when doing my job, I unintended also help others
- They enable sending e-mail to and from pages, enabling e-mail repositories and lists of useful links on the relevant page.
- By sending an e-mail to the relevant project page, you add both metadata to the page and to the e-mail.
- They are free form, but can be structured
- If one co-worker doesn't update his page, because of time constraints or just being dead, others can.
- They can be about such highly critical information as: Best restaurants in Berlin, travel suggestions to Kiev, the latest law and its implications, biographies of important people, a list of insultants, the next project meeting or the office Christmas party, without requiring a central command and control structure.
- They don't assume where knowledge is in the organization.
All in all, I would choose Jotspot. But if I would have to buy it for 2000 people, I would seriously request some changes in the software. However if you choose Socialtext you'll be happy to know that for the most part you won't need to think of implementation or user education.