Good post. My daughter is a college senior this year, and she pledged a sorority last year. They are extremely service oriented and have done a TON of community service. And she's having a blast while doing it. She's now vice prez and she's become their project coordinator.
She has already made lots of networking contacts, and we're sure her sorority service/affiliation helped her get a seat in grad school. I know darn well it didn't hurt.
Scoff if you must, but frats/sororities definitely are NOT just animal house revisited.
That resume will go a long way, especially if your prospective employer is a frat brother/sister.