By far #1 - Wikinomics
Meet Charlie - Quick read, but message is we are all going to work online.
Dissecting Blogs - 63 slides, but broken down fairly well. Always good to learn from others experiences.
Community Hotbeds (Jams) : Any insight into IBM is worthwhile, but slide 30 of 47 was interesting. Creates a visual network of connections via your emails. Within a large company I think this information would be valuable to understand how and who people interact with. Maybe even used to automate building networks.
Sowing the seeds of Enterprise 2.0 - Good visuals in a preso, will be using this style myself. But I like this quote in defining 'enterprise 2.0' "The future has already arrived. It's just not evenly distributed yet"
Enterprise 2.0 Case Study - Great style for 172 slides! Found this to be motivational.
Somewhere in the middle of the road
Enterprise 2.0 - Trying to make the jump from web 2.0 to enterprise 2.0 by adding the concept of the tacit media. I am not sure I follow, and from what I do grok, not sure I agree.
Enterprise 2.0 : Folks working on defining Enterprise 2.0, but still does not have me convinced in the definition.
Don't rush to read.
Enterprise 2.0 Keynote - Wiki this, wiki that, but I think the message is 'distribution is disruption'.
Enterprise 2.0 - 3 slides on saying Web 2.0 in the enterprise is Enterprise 2.0. Not sure I buy this one.
Social Software - It's in German but found some interesting sites/links in there.
YouPlus - pitch for youplus?
Moss vs Mediawiki - I just suggest taking a look at the wiki comparison site.
Link for the full list on Slide Share is here.
Sribd has a collection of Web2.0 documents, but unorganized and many are not worthwhile.