eWhisper - 1:47 pm on Feb 10, 2011 (gmt 0)

These landing pages have been blocked for indexing through robot.txt (I hope this doesn't have any effect on QS)

That can affect quality score depending on how you blocked the bots.

If you used a global disallow - then you are OK as adsbot-google (the bot Google uses for crawling destination URLs) ignores global disallows. If you are automatically detecting bots and adding them to the robots.txt file then you will need to make sure adsbot-google does not make its way into the file. If you are using some other method of bot blocking, it might depend on the method being employed.