Definitely "grab this". "Widget menu" sounds like something that would be used by the site's administrator, not a visitor. "Grab this" or "Grab This Widget" (or simply "Take Me!" if you want to be coy) clearly speaks to the visitor about a specific action THEY might want to perform.
On a side note, I think the placement of the link itself is very problematic. I kid you not, it took me (someone not intimately familiar with AB's product) a good 45 seconds to spot the actual difference between the two versions that you posted! That's not a good thing - most people won't spend that long looking for your link.
