It seems no on answered your question about moving from web 1.0 to 2.0.
My advice is one step at a time.
You can start with a blog, but you MUST take the time to post something othervise it is pointless.
After a blog watch you users. are they twitters or facebook users?
It is easy enough to create a fanpage on Facebook, and it is possible to get the feed from blog into facebook.
I also created a twitter account when creating the facebook fanpage, but our users are not normally twitters, so i have the feed from status updates from facebook directed into twitter. this is also so that I don't have to post several places. I change the status very often. If the administrators don't use it why should your users?
Right! If you started using the blogand have a feeling people are using it - next step is the widgets. I put in widgets for twitter and delicious as well as meebo.
If you use the meebo widget it is important that you actually log on meebo (I always have it running in the background).
Also put in a widget or link to facebook - let them know that you are there.
After this you can start looking at wikis, librarything, flickr, slideshare, question manager, Google docs, google groups and librarysystem.
A little warning though. It is not always easy getting the colleagues with you on this, so it can be a slow process, and it takes up a lot of time if you are running it all by yourself.
A input for our blog about free online dictionaries took me 5 hours to put out, finding the dictionary testing it and writing about it, and then on to the next - about an hour on each dictionary, which is normal time for testing and writing about a new tool or page.
Feel free to contact me if you need assistance.