Does anyone know how to get this funky underline effect like on this site (http://www.amorecanto.com)? Thanks guys :D

there are many different ways to accomplish that effect but here is how she did it...

on your page, just put <u>your text here</u> to acheive a simple underline and then in your CSS put this:
u
{border-bottom: 1px solid #99FF00;}

to achieve the 2nd underline