I don't know what cufon is, but @font-face is now widely supported:

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Internet Explorer 4.0
Embedded OpenType fonts only (eot)

Internet Explorer 9.0
Web Open Font Format (WOFF)

Firefox (Gecko) 3.5 (1.9.1)
TrueType and OpenType fonts only

Firefox (Gecko) 3.6 (1.9.2)
Web Open Font Format (WOFF)

Opera 10.0
TrueType and OpenType fonts only

Safari (WebKit) 3.1 (525)
TrueType and OpenType fonts only

iPhone / iPad
SVG fonts only (WOFF support has gone into WebKit nightlies so may appear in iOS in a future update)