SIM-DL Server and Protege plug-in released beta2.3
The new beta versions of the SIM-DL semantic similarity server and the Protege plug-in (for 3.3.x) are available at sourceforge. Please note that this release contains a lot of experimental new features and is unstable (so using beta 2.2 may be a better idea in some cases). The new features (e.g., similarity estimations) are described in the FOIS 2008 paper linked below.
Janowicz, K., Maue, P., Wilkes, M., Braun M., Schade, S., Dupke, S., and Kuhn, W. (2008; forthcoming): Similarity as a Quality Indicator in Ontology Engineering. 5th International Conference on Formal Ontology in Information Systems (FOIS 2008). Saarbruecken, Germany October 31st - November 3rd 2008.