Shannon Clark of Meshforum had some valuable comments on our book. My comments to his points are in brackets.

I’m also not sure about the stats you cited [in your book] about IM clients – at least in circles I follow ICQ seems very much on the wane with Skype very rapidly (within the year) becoming the primary IM client for many people I know, myself very much included – while I use other clients and systems, I tend to focus on giving out my Skype address. [DT: I agree.]

Another item you might want to mention in the general blog section are tools such as Blogjet which allow a user to compose entries for a blog offline/on their own machine – but then add them to a blog running nearly any of the major blogging software packages (whether a hosted service or an installed system).

You may also want to mention MSN Spaces (over 5 millions blogs in < 1 year) and Yahoo! 360 as two of newer and very large blog hosting sites. And with those numbers I think the 8 million number you cited is low by many multiples (not to mention that there are many times that many blogs outside of the US). [DT: That was a typo.] Definitely one of the more challenging sections for you to cover without being dated. ... Do you address podcasts at all? I think they offer some unique opportunities - with the value for many people not probably being in setting up your own, but in participating in the best and most valuable ones for your audience (not dissimilar to the value of participating in media outside of the Internet). They also offer a unique value-add proposition for using the Internet to find and participate in specific conferences - the recorded audio from those conferences can reach 20x even 100x more people than the conference itself (MeshForum for example reached 50 people or so in person, but the online audio sessions are likely reaching 20,000+ and since some have been amongst IT Conversations top 20 rated sessions ever, it is very likely that they will reach significantly more than 20,000.