I have become much more active with my Tumblr site. Tumblr appears to occupy a space between a traditional blog (like this one) and Twitter. For me, it seems to be very useful for posting travel photos and other photos which I'd like to share along with a blurb and/or some links, but which don't merit an entire post on this site. I have also used it to post video links, article links, as well as repost items of interest I've found on the Tumblr sites of others.
If you are interested in a more comprehensive collection of my photographs, please visit my Flickr account.