tinman spent a few years mucking around industry before going back to school for a Masters. Currently not enjoying the weather in North England..
He wrote Perl that looked suspiciously like C code in 1998, while working as an intern, and has been trying to cure that bad habit ever since.
It's probably old news by now.. but Greasemonkey has serious, potentially fatal security flaws. The dev blog entry is here.
Having said that though, it's still possible (although not recommended, certainly) to use the old Greasemonkey safely. If a script isn't injected into a page, it can't be exploited. So, making sure scripts only execute on explicitly added pages (instead of using wildcarded includes) is one option.
Another, more obvious option is to install the update. And live without the fancy gm_ namespaced functions for a while.
Unless the specific sites that I use Greasemonkey for are compromised, I think I'm fairly safe. Famous last words? Maybe