Yes, it has been released, you can even order a free CD ! almost 96% of the users haven't had any problems using it, and it fixes a lot of bugs and security issues .. but those other 4% had problems with their PCs while installing the SP2 update.

Before installing SP2, it is very recommended to BACKUP your data.

For more info on windows XP service pack 2 :

http://windowsupdate.microsoft.com/
http://www.microsoft.com/technet/prodtechnol/winxppro/maintain/winxpsp2.mspx
my teacher said that sp2 is full of holes..havent tried it myself
Khayeh Samer!! Mashilna Yeha !! Link Meneh biya3mil Download lal SP2 !! 2aw Link Menak Biya3melo Update!! Wein El Meshekleh!!??
ma khass ya zalameh mech osit linkeh aw linkak, ossit anno it's always better to download from the official site ! ;)
Samer's Right And It Will Take Less Time To Download From Windows Update Because It Downloads Only The Files You Need.
i heard that windows update now doesnt include SP2....i read it on microsoft.com ... maybe now it's back, but when i went to get it from windows update, it wasnt available
I tried windowsupdate 2 days ago, SP2 is available
oh cool :D if u dont find me now, check in windows update, u'll find me there updating :P
2 months later
guys... when i first installef the sp2.. i had it on cd qith windows xp..... official from microsoft...

but now i guess i lost the key..... any way i can retrieve it?
if you had the original, then you could contact microsoft.
You can download a software that can retrieve your installation key (Tweak-XP pro for ex.).