Fixes
I love it when Apple fixes stuff that I didn't know was broken. Mac OS X v10.3.8 among other things "Addresses an issue with Mac OS X 10.3.7 in which iChat, Mail, or other network-based applications could take a long time to open."
I had this very problem when I was traveling in San Francisco in January -- it freaked me out. Mail took a long time to open. Haven't seen the problem since then, but I'm still glad to see Apple on it.