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