Been experimenting with evidence-based medical search and building medical systematic-reviews. Playing with a format for entering and viewing stuff. The first thing I did was put in some of the data for a systematic review of Surgery as a therapy for sciatica, which includes an evidence summary and a pubmed query.
In case your curious, there is evidently no evidence that surgery does better than conservative therapy.
Another review I put in was one for saw palmetto as a therapy for BPH.
Rather than finding no evidence for effectiveness, they found evidence for ineffectiveness of saw palmetto.