^
Mugen, when I first got into SNSD, a few ppl recommended that I should watch Girls Go to School or MTV SNSD, both on youtube and subbed by soshisubs. Basically they show what the girls were like when they debuted 3 years ago and IMO haven't changed that much since then.
Other than that, there's Hello Baby, Factory Girl, Horror Movie Factory, lots and lots of fancams, CFs, radio appearances including Taeyeon's radio show, dance battles, Music Core, Invincible Youth, Family Outing, Strong Heart, We Got Married (one with Taeyeon and the other currently with Seohyun), and one of my favorites, Intimate Note.
I like Taylor Swift too.