Nice site: 60pounds.org.
Needs good follow-through and a developing campaign rather than to be a one-off, quickly forgotten initiative, but so far the signs are good for this campaign website about Liberal Democrat tax cutting plans.
UPDATE: In haste – and a very good email from Tim Farron going with it. Short, to the point, built around promoting the website and telling a story. It even avoids the curse of thinking that a good political case is made out of bullet points and decimal points. Good stuff.