The Syndex Tumblr theme was made for personal reasons. I just wanted a mood board, like Haw-Lin or AAA-Feed, but with more functionality, such as being able to tag images so I could search for them later. In just over a year the theme has accumulated 830,000 users with between 1,000 to 2,000 new installs everyday, and is one of the most popular themes on Tumblr. It's being used by designers, Bieber fans, porn addicts, and even Grizzly Bear. You can get Syn[oynym In]dex here. Syndex 2 for WordPress is launching imminently and will be geared for creative portfolios.