Fontsquirrel also has a webfont generator. You can upload your version of the font and have it generate a version to use with @font-face. As Sega said there are issue around legality with fonts and there are good libraries and many free versions of fonts available. However it isn't always possible to achieve an exact match for a client, your options are to either source a webfont version, find a suitable replacement or at a push generate a webfont version. It is the least preferred option but many of the font licences never took account of use on the web. Given the price of many commercially available fonts that are used for print charging again to licence for use of a web version is double-dipping in my personal opinion. Having said that with so many cheap alternatives there really isn't any need to be hung up on a particular font.
I can say that I've personally used both Typekit and Google fonts and there is ample choice in both.