According to their website (incidentally, it's hosted on Tom Tancredo's site), here is their list of legislation. Nothing has passed, and some of it (e.g., HR946) is downright silly. So the caucus, at least, doesn't really count for much in that regard.
To be part of a "caucus" is a way of expressing concern about a given issue, and immigration is certainly worthy of concern. And you're right: there are a number of folks represented ... but the members named are not joined at the hip with Tancredo. Many of them -- unlike Tancredo -- are actually pretty effective legislators.