There's also CG-FlashyTitles. Using 'sIFR' technology, based on building Flash .swf movie/'font' files from a selected font on your system (or downloaded .swf files), sIFR replaces selected text with a Flash movie using the selected typeface.
In many ways it is easier to set up, especially if the .swf for the font you like already exists (though, there are now free conversion tools, whereas a year ago you had to own Flash...). And, because it is 'on the fly', it downloads the .swf ONCE, then can use it for any titles on the site that reference it.
This is in contrast to server-based 'image replacement' systems which can use PHP (etc) to convert say a truetype font on-the-fly, make a JPG, and stick it in place of some text. But if you change the text, you created a new JPG every time.
The advantage of the image replacement techniques is that they can easily 'spice up' the title being generated -- things like drop-shadows usually come to mind. And, it's pretty much 100% compatible with any image-viewing browser -- however, it might not look right otherwise.
Just thought I'd share some tech details. ;)