Is still very much conservative, conservative, conservative!
From Media Matters:
Overall, there were 75 appearances by Republicans/conservatives during this time period, but only 50 by Democrats/progressives. If we remove the neutrals (a category that includes guests who are centrist or nonpartisan) to examine only those with a clearly identifiable ideology, we see that the imbalance has been, if anything, slightly more acute in 2006 than it was in the years 1997 through 2005.
There are more numbers and graphs at the site and they all show an imbalance that favors conservatives. And while I think this isn’t particularly surprising given that Republicans control the Congress, Senate and White House…maybe a little more balance would be appropriate?