Please make thread titles which have new posts since last viewed stand out more. Currently it's very difficult to tell which threads are bold and which are not.
That's why unread threads have a dot to the left of the title. But really, the bold vs unbold thing tends to vary by OS. They seem very noticeable in Windows; less so on a Mac because of the different text rendering approach.
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Wow. If this was Floris' problem (I don't know, combined with his eyes?) then I surely understand the issue now. This is what it looks on my Win XP (with default font settings, no cleartype etc) and FF: