I recently decided to try Shiira again to see how far it's come. Wow, this ain't a bad browser now. I've found Safari is usually fast, but while it is loading a page, the whole thing seems to come to a halt. No switching to another site and creating a post while IGN and eBay decide if they want to load (as I'm doing now) in Safari. My only complaint is that I can't figure out how to make the Google search field not absolutely tiny.
Anyway, if somebody is looking for another browser, I just thought I'd mention this as one worth a go.