Just wanted to pop in and say that this thread has converted me into a fan. I think all the girls are attractive (including Hyoyeon) which got me to come here in the first place but it turns out I like their music as well.
What I really didn't expect was to start watching reality (or as they call it, variety) TV again. I tend to despise most western reality TV nowadays but I'm really enjoying the Korean variety shows. I just feel there is less artificial drama and more pure entertainment/comedy and/or "reality", if that makes any sense (what reality TV used to be here). I'm about halfway through Invincible Youth right now and will likely go to Girls Go To School next (yeah, I should have done that series first).
As for the obligatory rankings, as of now:
SNSD Members (having only seen IY, Factory Girls, and a few Star Kings):
1. Sunny
2. Tiffany
3. Taeyeon
4. Sooyoung
5 - 9. The Rest (Need to see more variety shows)
Songs (cliche list incoming):
1. Genie/Tell me your wish
2. Gee
3. Hoot
4. Girls Generation
5. Run Devil Run
P.S. I've been going through the songs of the other female k-pop groups featured on IY and I have to say I'm surprised by the amount of hip-hop/rap that k-pop groups use. It makes it rather unique when compared to western pop music. I have to say, I'm going through Brown Eyed Girls music now and I may end up ranking them higher than SNSD (S.I.G.N is my overall favorite k-pop song thus far).