Firefox auto-update + safari thumbs down
This program (Firefox auto-update) just looks after updates for ONE product. IIRC It's the same with Thunderbird which just pops up to say "we've updated it". Maybe this starts a debate which says should each application take care of it's own updates, but this might be deemed inefficient. Anyhow, I rate that - if you're happy with a browser (easy to reinstall if something breaks - just make sure you use foxmarks to backup your bookmarks), surely relatively inobtrusive security updates taking place whilst you get on with your business are a good thing. Remember you don't HAVE to restart the browser until you're ready (to apply the update) too.
I'll also agree that Safari is utter b0ll0x. Whilst I'm looking at getting a 20" iMac later this year (I'll furnish it with some kind of VM tool for running windows networking experiements), it'll be like my iBook - Firefox as default. I've found the rendering by safari to be so unreliable on some sites that it's not true.