i've been perusing some of the decks being played now for the past couple of days and was wondering..

Deep Sea Diva - why? I understand the SS effect, but what else would you get? Another Diva?

Since ive been out of the loop for a minute, i'm still getting a hold of what being played now, and what I should be looking for.

You get another Diva so you can set up a flurry of Synchro Summons in Zombies. Check out this thread it has all the answers you are looking for:

http://www.ccgrealms.com/forum/showthread.php?t=511145

Yep, it's highly effective in a Zombie Deck, especially with Undead World so it can take advantage of being turned into a Zombie as well as other things like Bolt Hedgehog.