The founders of Jaiku have still plans for their service. It has been quite clear after the acquisition that Jaiku is only 20 % project for them and Google has no interest on it. Please, read a blog entry by Jyri Engeström before making any speculations:

http://www.zengestrom.com/blog/2008/...etrospect.html

What is going to happen is actually an excelent thing: Jaiku Engine will be open source! That is also told in the original article and several other related stories:

http://google-code-updates.blogspot....rewell-to.html

http://searchengineland.com/google-e...ll-jaiku-16166

http://www.inquisitr.com/15363/jaiku...obref=outbrain

And yes, there are plenty of plans for Mauku too.