Twitter Widget Font too dark

You’ve got a CSS class of “widget_twitter” in the li right above that:

<li id="twitter-2" class="widget widget_twitter">
<h2 class="widgettitle">
<a href="http://twitter.com/triagebanduk">Twitter Feed</a>
</h2>

so it seems like you could add something like this to your style.css:

.widget_twitter h2 a:link, h2 a:visited {
  color: #ffffff;
}

I’m not sure you’re going to need the h2s in there, but I’d test it first with them and see. You already have a hover state for the link text that shows up okay, so I left that out.