I just wanted to post this as a comparison between Windows 7 and Windows Server 2008 R2.
Dad's machine:
HP A6230N
Windows 7 Ultimate 64-bit
AMD Athlon 64 X2 5600+ @ 2.8 GHz
3GB PC2-5300 RAM
320GB HDD
Nvidia GeForce 6150SE
Programs Installed:
uTorrent
Adobe Flash Player 10 ActiveX
Adobe Flash Player 10 Plugin
Adobe Reader 9.3Adobe Shockwave Player 11
Apple Software Update
AVG 8.5
Cyberlink PowerDVD 9
Gold Miner VegasGoogle Chrome
Java 6 Update 17
LimeWire PRO 5.4.6
Malwarebytes' Anti-MalwareMicrosoft .NET Framework 4 Client Profile
Microsoft Office Professional Edition 2003
Microsoft Visual C++ 2008
Monopoly City
Mozilla Firefox 3.6.8
MSXML 4.0 SP2
Nicktoons HoverZone
QuickTime
Spin & Win
Virtual City
Vista Volume Indicator
Visual C++ 8.0 Runtime Setup Package (x64)
Way to Go! BowlingShark007 Vista Codecs
WinRAR
Yahoo MessengerMy machine:
Gateway GM5632E
Windows Server 2008 R2 Enterprise
Intel Core 2 Quad Q6600 @ 2.4GHz
4GB PC2-6400 RAM
500GB HDD
Nvidia GeForce 9400GT
Programs Installed:
uTorrent
Adobe Flash Player 10 ActiveX
Adobe Flash Player 10 Plugin
Adobe Reader 9.3Auslogics BoostSpeedAuslogics Disk DefragDivX Codec
DivX Player
DivX Plus Web Player
DynDNS Updater
eBoostr 4
ESET NOD32 Antivirus
Google ChromeInput Director v1.2.2Java 6 Update 21
Limewire PRO 4.18.8 Magic ISO Maker v5.4Malwarebytes Anti-MalwareMicrosoft Office Professional Plus 2007Microsoft Visual C++ 2005 RedistributableMicrosoft Visual C++ 2008 Redistributable
Orca
PE Explorer 1.99 R6
Universal Extractor 1.6.1
Shark007's Vista Codec PackageShark007's Win7CodecsWinRAR
Yahoo Messenger
BLUE = Program exists on both mine and my dad's computer
RED = Program only exists on my computer
GREEN = Program only exists on my dad's computer
Both computers have ALL startup items disabled in MSCONFIG and all services enabled. I rebooted the computers so it would represent how much memory is being consumed when OS when its been refreshed (so its a fair comparison)
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The Results:

My dad's computer running Windows 7 Ultimate. As you can see his machine is using 64 processes and consuming over a 1GB of memory on startup (1.04GB)

My computer running Windows Server 2008 R2. It uses only 38 processes and 636MB of RAM, 39% less RAM than its desktop counterpart Windows 7.
This is a completely unbiased review of both operating systems that exemplifies their resource usage in their natural state. I have not modified the operating systems in any way other than disabling the startup items in MSCONFIG.