Contributed By: Cliff Hobbs [MVP SMS]
The following is a list of the SMS 2.0 Service Packs complete with links to allow you to download them:

SMS 2.0 SP5
http://www.microsoft.com/smserver/downloads/20/servicepacks/sms20sp5/default.asp

SMS 2.0 SP4 HRP
To obtain the SMS 2.0 SP4 HRP immediately, contact Microsoft Product Support Services. For a complete list of Microsoft Product Support Services (PSS) phone numbers and information about support costs, visit the following Microsoft Web site::
http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

SMS 2.0 SP4
http://www.microsoft.com/smserver/downloads/20/servicepacks/sms20sp4/

SMS 2.0 SP3
http://www.microsoft.com/smserver/downloads/20/servicepacks/sms20sp3/

SMS 2.0 SP2
http://www.microsoft.com/smserver/downloads/20/servicepacks/sms20sp2/

SMS 2.0 SP1
No longer available