http://www.cqure.net/wp/2010/03/detecting-apple-mac-os-x-afp-vulnerability-cve-2010-0533-with-nmap/
I'd upgrade if I were you.
TL;DR? 10.6.2 has an exploits that lets anyone read anything in your home directory.
It's an interesting exploit. While it lets someone read anything that's in your home directory and doesn't have restrictive permissions (in other words, anything with what "Get Info" refers to as "Everyone" permission), they can't read subdirectories of your home directory. So they won't have access to your Documents folder, for example.
But yeah, that's a compelling reason to upgrade right there.