(Thanks to Carolyn Chau)

If necessary, you can use the old SSRS web parts we provide in Reporting Services 2005 with SPS/MOSS  2007. However, they won’t work automatically – you'll have to get them registered in the GAC with stsadmin.exe. Example:

Stsadm.exe o addwppack filenamec:\program files\microsoft sql server\90\tools\reporting services\rswebparts.cab -globalinstall