wikis

So, I'm playing around with implementing wikis in my class for our next unit.  I feel a bit like I'm in uncharted territory.  I ran into several problems the last time I used wikis.  For example, several times students would override others work by being on the same page at the same time.
This time, I received a free educator account and set up student logins and passwords.  Hopefully this way I can try to track changes easier.  I'm also working to create a wikinetwork of pages so not everyone will be working on the same page.  I'm thinking about expanding on this idea of a network to include not only wikisites, but also my blogger, my school's google site, twitter, and perhaps titanpad for student collaboration.
I'm imagining that the google site is the central resource start place.  Students are already used to going to this site.  From there I want the blogger and wikis to work hand-in-hand.  The blogger to be a place to detail class assignments and the wikis to be a place for students to work and collaborate.  The twitter can be a place to give shout-outs for good work and homework reminders.  I really like the titanpad as a source for students to do some collaborative writing in real time.  We'll see how it works together!