Suckerfish Dropdowns – HTML Dog: “The original Suckerfish Dropdowns article published in A List Apart proved to be a popular way of implementing lightweight, accessible CSS-based dropdown menus that accommodated Internet Explorer by mimicking the :hover pseudo-class.
Well now they’re back and they’re more accessible, even lighter in weight (just 12 lines of JavaScript), have greater compatibility (they now work in Opera and Safari without a hack in sight) and can have multiple-levels.”
A lot of people have had problems with the Son of Suckerfish dropdowns, so perhaps this will be a big improvement. There are also pure CSS dropdowns in Eric Meyer’s More Eric Meyer on CSS and Project Seven offers some well tested drop down menus as well.