I guess my problem is that the groups I collaborate with contain people who aren't really able (or sometimes willing) to use sophisticated groupware, especially not if the use case requires them to use it in one particular way. My collaborative documents are therefore either restricted to small subsets of the group, in which case Google Docs works fine, or need to be easily findable by and open for read access only to people who don't have accounts in the groupware system, in which case really what I want is either Drupal or Mediawiki.
Wave is still in the very early days. If it succeeds, it will largely or entirely replace e-mail, being as available as e-mail is, with many different UIs on many different platforms. So, right, for now it only works in much more narrow circumstances.
we've had a wiki at work for a while, and then the business pushed a sharepoint server. so i'm working with both. mediawiki wins for searchability of text content. sharepoint makes it trivial to handle specific documents and has version control built in, and i believe you can search within documents. you can have some measure of granularity on who can have read or readwrite access to docs, there.
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