PeopleTools has just completed certification of Windows 7 for PeopleTools 8.49 and 8.50. If you are looking for information on it, have a look at the most recent Tech Update on My Oracle Support (see link below). Additional detailed information can be found in the Certification Database found on the Certification tab in MOS - click on component certifications to see the Certification Notes.
You'll also find comments on the certification for Windows Server 2008 R2 in the Tech Update below, as well.
Note that Crystal 9 (8.49) will not be supported on Windows 7, per SAP. Crystal Reports 2008 (8.50) requires SP2.
Tech Update - Oracle Completes Windows 7 Certification for PeopleSoft [ID 1128878.1]