Bandman writes: Our needs for good information and documentation have not changed, but the way that we get it has. The ebook revolution has made physical shelves of sysadmin books endangered species. A bigger issue may be that even ebook sales of books related to system administration have not been selling. Somewhere along the line, people stopped buying things like "DNS and Bind" or "Sed & Awk".
Having an "I hate this ad" button under every ad, with an opportunity for comment would be useful. Possibly that could be tied in with some way to say you like a particular advert, even if you have no interest in a given product. Kinda like a spam filter
There are also OSS tools. I had a play with BoonEx Dolphin recently, and it did lots of the "internal Facebook" sort of stuff. It was pretty easy to deploy, and allows nice little bits like chat/walls/video/photos. Might be overkill for a small group though.
Places I've worked, Jabber/XMPP is really handy. I found that IM neatly bridges the gap between "warrants a phone call" and "can wait until you check your email". Also it's a far better way to get alert messages.