Wham! Pow! (from Color Club's Poptastic Collection) is possibly the most aptly-named polish ever - it's a total assault on the retinas!
My camera took one look at this colour and started quaking at the knees - it just couldn't capture it accurately! The bottle colour in the first photo is probably closest to what it actually looks like on the nail - glowing and neon and BRIGHT! Seriously, this colour is SO bright I swear if I touch my nails they'll be burning hot!
The formula on Wham! Pow! is lovely, thinnish and easy to apply. I used three coats because I thought I could see a little visible nail line, but I think two would probably have been ok. The finish is your typical neon satin, it's shown here with a top coat.