Funny, as YLF was the very first one I discovered & still makes my daily "cut". I say that because I've tracked many over the last year. There are a handful that I faithfully check daily - but for different reasons...
Jessica - http://whatiwore.tumblr.com/ (if I can only check 1 or 2 in a pinch this is one of them!). I love her personality, vintage/thrifty style mixed in with expensive pieces every once in awhile & the variety (she has 2 other sites now as well with "what I wore down the aisle & "vintagewhere").
http://gingersnaptoit.blogspot.com/ - this one is not always my style a little preppy for me some days & I'm not a bows kind of girl. However, the reason I check this one is because I absolutely love her positive & real outlook every single day. Genuine sweet person & it just puts me in a happy mood!
http://frecklewonder.typepad.com/ - Similar here. I LOVE the vintage finds! But, what really pulls me into this site is I feel like I am having a mug of hot cocoa & sitting in her living room. EXCELLENT family perspective!
http://www.lovemaegan.com/ - Gosh, I guess this one just channels the part of me that wants to feel a little sexy & tough everyday...LOL!
http://www.mystylepill.com/ - VERSATILTY!! I see over & over again how she can take one piece of clothing & wear it a million different ways. This one really challenges me to think through any purchase I make & I love that!
http://www.academichic.com/ - Scarves, Belts, education, and variety of personalities....
I am a VERY visual person - so the one's that don't have a daily picture very rarely stay on my list to check daily.
There are a few others I track on a daily basis but I guess these are the one's that stand out for me the most.