Thanks!
Good call on the target="blank" for the tweets! For those wanting to do this before I add it to the next release, find the for loop in "feed.js" and replace this line:
html += '<a href="http://twitter.com/' + username + '#status_' + data[i].id_str + '">' + data[i].text + ' <i>' + Twitter.daysAgo(data[i].created_at) + '</i></a>';
with
html += '<a href="http://twitter.com/' + username + '#status_' + data[i].id_str + '" target="_blank">' + data[i].text + ' <i>' + Twitter.daysAgo(data[i].created_at) + '</i></a>';
I'll add that to the next release so everyone can have it. As far as changing the h2 tag, the issue there is due to how the js is getting the username. This should solve that for you:
echo '<a href="http://www.twitter.com/'.$twittername.'" target="blank" ><h2>Follow @<span id="twitname">'.$twittername.'</span> on Twitter</h2></a>';
That seems like a pretty logical change so I'll probably add that to the next release as well.