The following point has not been considered so far in this topic:
This means we need to reconsider the security implications of using a URL that the browser - without a plugin - can in fact interpret, because it means that rather than sending a SAFE URL to a search engine, a browser would visit the website we administer instead.
Anyway, as I’ve suggested in the following post, I suggest that we revisit this discussion when we’ve got a better idea of the different options.