A big handicap graphic design for the web had to put up with until recently was being limited to a small number of ‘web-safe‘ fonts. These web-safe fonts were the lucky few considered so widespread that the chances of having a visitor that didn’t have them installed were negligible.
The fact that something as primary as the ability to download online fonts was lacking in HTML / CSS for so long made it necessary for third party technology-based hacks (as for instance sIFR) to fill up the gap.