How often have you been writing SAP NetWeaver Java code and you have to find out which Jar file to include for a certain class that you need. There is a cool web-site called SapJarFinder which will help you find the correct Jar file.
Even more impressive is the additional functionality that that the site provides:
A web-service that allows you to perform a search from any web-service enabled client or development environment
Browser Search Plugin
You can also provide code snippets so that others can see examples on certain classes.
Besides these very useful features, I also liked the interaction with SDN/BPX. Users can add their SAP SDN Business Card ID to their code snippets. Currently, the interation between SapJarFinder and SDN/BPX is pretty loose. Once again, SapJarFinder provides evidence that SCN content (user profiles, wikis, etc.) is valuable outside of the community itself. I think there would be even more external sites that could tap into the information source if there were more open interfaces (a problem which I wrote about in an Opening the Treasure Chest: External Access to SDN / BPX Content via Mash-Ups). For example, if the SDN code snippets wiki had a public interface (perhaps a web-service), there would probably be more contributions of code. The Eclipse/NWDS Plugin from SapJarFinder provides this feature and think it is a great idea.