Love Windows 7

Here are some of the public evaluation product keys given out by Microsoft:

Windows Server 2008 R2 Release Candidate Product Keys for Evaluation

Windows Server 2008 R2 Release Candidate Enterprise
Product Code : Q7Y83-W4FVQ-6MC6C-6QQTD-TPM88

Windows Server 2008 R2 Release Candidate Standard
Product Code : V4KRB-QDWK2-GVT4X-BV4XG-34TV4

Windows Server 2008 R2 Release Candidate Datacenter
Product Code : WXGKX-XXW8X-P8KTJ-PFX7T-DPYYW

Windows Web Server 2008 R2 Release Candidate
Product Code: RBBKH-BVD6B-74FV9-RYPJ7-TCFXB

Download Windows Server 2008 R2 RC from Microsoft Download Center