This works awesomely with:
http://userstyles.org/styles/5630

Basically, they cover what each other lacks. I was also having problems seeing the description text in my search results and the above fixes it for me.

I got this:

MySQL Whitepaper<wbr>: The informatio<wbr>n you need direct from the experts: The information you need direct from the exp...

Something kind of went wrong?</wbr></wbr>

Yeah, after the 51st character, I get <wbr>. Here's my subject line:

******** *** dba **********.com Customer Receipt/Pu<wbr>rchase Confirmati<wbr>on

(* character count is intact) I'm guessing that the replace is not occurring after the mouseover occurs and uses the original text (unreplaced text).</wbr></wbr></wbr>

I know this is a Google thing but for the heck of it, why not have it support Userscripts.org and have every page like this one?

Another suggestion... now that you've dealt with the <wbr> problem, could you keep it from being visible? Emails with long subject lines have <wbr> visible. A minor bug, so no need to for any rush.</wbr></wbr>

Why does this have "gmail" on this as a tag?

Cool, thanks for being so quick. It was a bad bug though. Totally froze my Firefox completely for at least a couple minutes before the "Stop Script" popup came out. Again, it's appreciated.

Oh, and after I click "Ok" everything works fine.

Got this error message:
"Over 40 cycles through while loop! Title is 15 Characters long"

My subject line contained 86 letters. The only strange character that might be causing problems is the ','. Other than that numbers and letters.

Oh, and this is an awesome script! Keep up the good work. I don't mean to sound unappreciative on my previous comment, just pointing out a bug that's affecting me.

The script causes Firefox to freeze up on really long subject lines.