See the Top 10 Reasons to Deploy Windows XP Service Pack 2 article.
What the article doesn't say is that there are changes in some hardware drivers. If SP2 is installed and for whatever reason (example: applications compatibilties) you want to revert back you can uninstall it via Add/Remove applet.
Trying to unweave, unwind, unravel
And piece together the past and the future,
T. S. Eliot
Heard tons about what SP2 does for IE. If I'm a NS 7.1 user, should I worry about this "security update"? Since IE is so integrated with XP, does running XP without SP2 leave my system vulnerable? What other changes, besides in IE, does SP2 do?
I'm asking because I will soon be going to college, and be hooking my system up to the college network for Internet access. I know the sys admin. of the college, and know that we are well protected from outside attacks. I have Norton Internet Security to prevent attacks from the inside. (IE Other students)
Is it safe to wait until X-Mas to install SP2? I'll have more time to correct anything if something goes wrong that way.