I use Photoshop and don't need any filters. PS's native layer styles are quite sufficient for almost any effect.
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Web Goddess & Web Standards Evangelist :) - Tables Be Gone !!
"Using or working with IE is like having to wear a 1970's polyester suit with pantyhose and a girdle, to work everyday" Carolina Corvette Club
All I usualy do to make a button looks great - add few gradients here and there. But sometimes even a simple plain color filled rectangle with a thin border looks better than most of fancy butons.