Helvetica, it is not ...

... but it is my very own font =)

Fontstruct lets you design your own font, publish it, download it, and use it. The drawing tools are somewhat limited - but some people have managed some pretty amazing fonts with them (such as this one and this one, or how about this one).

I can already think of several people who would jump at the opportunity to design their own font, so a word of warning: it takes a long time to design all the letters - upper case, lower case, numerals, punctuation marks, and special characters - for an entire font, so expect to spend an entire evening doing it. =)