As one of the current Sequel Pro developers I can backup jabkobob on this one, it's not an easy task. It's not that we're ignoring the requests we get to add support for PostgreSQL or any other database system for that matter, it's simply a matter of time, of which most of the core devs don't have just now. We have a lot of plans around this area (as well as others) for the app, but it's going to take time.
Despite every release of Safari reducing the feature set of SafariTabs (which is good), I've had a load of requests for an updated version. It should be available within the next couple of days:
Thanks for everyone's support.