You might want to play with the alternative font choices. NoScript defaulted to blocking the Google-hosted font, and the Arial fallback is a lot wider and makes the page look bad (it turns the button into "MAKE MES").
How does it deal with multiple people having the same name? I could see John Smith getting either very excited, or very annoyed. Do you have a strategy for that?
That's a feature. It makes life more interesting to see what messages people are sending to all the other John Smiths.
On a more serious note, it's probably going to be most useful for people with moderately uncommon names... middle name support is possibly on the horizon.