I know that Meta SO has a list of copy-cat sites and legitimate SE 1.0 sites, but I searched over there for http://ask.recipelabs.com and didn't see anything. It certainly looks like an SE site, although I see no mention of Stack Exchange or Stack Overflow except in the source (meta tags)
<meta name="generator" content="StackExchange 0.9 (20100413135304-37b86aed49ad)">
Looks like we are way more popular, they only have a handful of active users.
Is there anything worth doing with it? Alert the admin that there's a similar SE 2 site? Leave it?
EDIT: Found it on meta.SE in this answer.