I’m a huge fan of Windows 7. It’s the first time I’ve ever run a Microsoft OS on my primary (home) machine. I’ve compiled a set of programs that I have found to be invaluable in using Windows for serious development and computing. All are free and clean of any ads or spyware.
EaseUS® Partition Master 9.1 Home Edition

As Partition Magic alternative, EaseUS Partition Master Home Edition is a ALL-IN-ONE partition solution and disk management freeware. It allows you to extend partition (especially for system drive), manage disk space easily, settle low disk space problem on MBR and GUID partition table (GPT) disk under Windows 2000/XP/Vista/Windows 7 (SP1 included) 32 bit and 64 bit system.
Process Hacker
TeraCopy
WinDirStat
Write Monkey

Write Monkey is a knock off of the Write Room full screen distraction free applications for OS X. It’s quite well done and free.
Putty & Putty Connection Manager

PuTTY is a free implementation of Telnet and SSH for Windows and Unix platforms, along with an xterm terminal emulator. Putty Connection Manager can be used as tabbed version of Putty. It works on all the editions of Windows OS i.e Windows XP, Server 2003,Vista, Server 2008 and Windows 7.