A useful tool both personally and professionally. I like that we can find out other similar sites or other popular sites that are similar to ones that I'm interested in. As a librarian I use the internet quite a bit in day-to-day work and it's great to see what other similar sites are out there.
I like that we are able to select which sites we make available to the public and which ones we keep private too.
Like everything else that we are doing here, I can see that I can potentially make great use of it - when I make the time. So hopefully during these school holidays when things settle down a bit I'll take the time to re-visit some of these sites and to explore and organise them further.