Pho Kim Long is in Vegas Chinatown. It's open 24hrs! It's in the strip mall called "The Center at Spring Mtn".
Lines can be long here. I went when it wasn't busy on Wed 12/28/10.
Got:
iced coffee - it's made for u then brought in a Styrofoam cup - taste ok.
Seafood rice noodle soup - small bowl, some fish cakes, a few fish balls, taste ok
Pho - B. thought it was alright.
On Choy - Chinese greens we liked it.
Credit cards allowed. Separate bathrooms in the back.