The time has finally come to throw Arial and Verdana into the trash (Helvetica can stay for a while), as Monotype, Linotype and ITC (and others) have teamed up to develop a really cool service - web fonts!
webfonts.fonts.com lets you use over 7,500 fonts on your sites. The result isn’t images, but markable, search engine friendly text.
Web fonts is free up to a certain amount of page hits, but the free account will not give you access to all fonts. Still, 1.500 fonts is a great service, so make sure to try it out!