Why? Honestly - if you're shipping version 1 the only people that are going to care are people who know what twitter bootstrap is. That's less than 1% of 1% of the population. So why spend precious time catering to that group? Did you check whether the site works in IE6 too?
Heh, my photoshop skills are sub-par. I've been putting off replacing the banner with a more robust site intro/overview, sounds like I need to make that happen.