Within Google Webmaster Tools > Search Traffic > Search Queries, for a particular (highly competitive) single keyword, my site is showing "Avg.position" as 2.0 for the last 30 days. However, if I search for this keyword then my site does not appear at all in the SERPs (checked the first 10 pages, logged in/out, different Google sites).
Could this just be a bizarre "blip" in Google Search? Presumably it must have appeared at #2 in the SERPs at least momentarily for someone?! Am I missing something?