Covering the story was the excellent British site, NHS Behind the Headlines.  The story was reported on BBC, and follows a journal publication December 30, 2009, in the Journal of Natural Products, which admittedly, I don't follow all that closely!

The article, which is very long and detailed, describes a few cases of mostly children who ingested Gingko seeds, then developed seizures.  In one case, gingko blood levels were measured and documented to fall after ingestion-related seizures.  The authors go on to discuss the possible mechanisms of Gingko toxicity.

The association was first described in cows who eat the seeds that disperse in grass, a "condition has been termed 'albizziosis'."  Evidently it's a big problem in South Africa!

This paper isn't what you would call strong evidence of a link--there doesn't appear to be a problem with Gingko as people currently use it in supplements, and there is not a clear link that routine use of Gingko will lead to seizures, but still.  It may be worth remembering, next time you have a hard time explaining a seizure, to ask whether the patient is taking supplements.