We've stopped quoting that now that we have competitors, because if that became a matter of competition, it would tempt people to do bad things. (E.g. you could encourage single founders to apply, knowing you were unlikely to accept them, instead of telling them frankly that they're less likely to be accepted without a cofounder.)

Why do you care?

I didn't think YCombinator was a very competitive company, and I wouldn't think you'd care about what the competition thinks.

Actually, I noticed pg was pretty grouchy about TechStars when they first appeared. Particularly in the way TechStars abused application numbers to try to appear on a level playing field with YC in the media...even though the startup community, in general, tends to take them somewhat less seriously (they haven't yet proven they provide significantly better outcomes for their startups the way YC has...that may change, but I think it's fair to want them to get legitimacy through success rather than comparisons to the success of the YC model).