Hmm,
There seems to be a cacheing issue - change the search term and you keep the results from the previous query
eg:
http://alf.hubmed.org/metalatest/?q=biodiversity+informatics keeps the xtech search results. Full refresh doesn't fix this.
Nice idea tho, and cool talk at Xtech - main conclusion - there will always be a jumbled mess, be they objects, or collections of databases trying to categorise those in a mass of ways.