I have added Swimming as a category after a suggestion from Blaine from Run To Win. Swimming seems like a natural fit considering we already have a Triathlon category and the sport fits nicely with the general theme of the site.
ActiveKix is currently running on a beta build of revision 559 of DotNetKicks so the site is evolving quickly with many improvements to existing functions as well as the addition of new features. With the more recent builds there is a move away from the use of categories and towards the use of a tag based structure for the categorization of content. I'm hoping this will allow for a hierarchical structure in the future that will allow for the sub categorization of links (an example would be Running at the top level with Cross Country and Marathons beneath). You'll notice that each time a link is submitted a tag is attached based on the selected category so selecting 'Running' will attach a 'Running' tag to the link. You can still custom tag links so they can be easily accessed from the tag cloud page or on the right side of most pages.
Please contact me if you have any category suggestions or feedback regarding ActiveKix.