On the Ricochet member feed, Mothership_Greg asks me "What is Paul Ryan's PQ?".
The answer is 11.3.
That places him about a step more liberal than Mitch McConnell (9.0), while a step more conservative than John McCain (15.9) or Lindsey Graham (15.1). It places him about two steps more liberal than Michele Bachmann (-4.1) or Jim DeMint (5.1). It places him about equal to Newt Gingrich's PQ (11.4). It also places him about equal to my PQ (13).
(If you click about halfway down this page you can download a spreadsheet with PQs of all the members of Congress.)
The questions on which PQ scores are based come from roll call votes in Congress selected by the Americans for Democratic Action. Each year the ADA selects 20 important votes for the liberal agenda and designates whether the "yea" or "nay" side is how a liberal should vote. In 2009 and 2010 Ryan voted against the liberal side in every case. However, in 2008 he voted three times (out of 20) on the liberal side. Two of these were votes on extending unemployment benefits. One involved voting with unions on a "prevailing wage" issue. In 2007 he voted twice (out of 20) on the liberal side. One was to reauthorize Head Start (only 48 House members were conservative enough to vote no on this). The other case was to vote in favor of giving the District of Columbia representation in Congress.
The Washington Times has a good analysis of Ryan's voting record, which it calls "conservatism tinged with a maverick streak." I think that's a good description as long as one adds the caveat, "not quite as maverick as John McCain."