Here's another networking feature that we are currently working on and will be soon available as a feature app.
Custom styles can be applied or you can select from popular social themes like Youtube or Facebook as shown in demo above. This should be available for Blogs, Forum, Events (2.0), Photos, Videos and Photo Tagging App, etc..
Tag optimization and search terms can be enabled by generating the most popular tags or manually entering suggested tags (dashboard) for your community :-)
Full Autocomplete tag feature recommended for Ning 2.0 networks. Available also for Ning 3.0 (TBD)
Let me know if you have feedback or questions.