I did a lot of custom WordPress development for this site, but the highlight is the browsing interface for their large library of publications. Publications are presented in a table using the great open source DataTables jQuery plugin. We needed even more filtering abilities to refine the table contents, so I wrote an add on for DataTables to allow filtering the table based on unique values in the table columns. You have to play with it to get how cool this is! Geo Mashup is also featured in the global map of partner sites.