Some obvious ones not mentioned
Apart from the article dubiously recommending OpenOffice instead of the more featureful LibreOffice (does anyone with a new PC bother installing OpenOffice any more?!), here's some "obvious" ones left out:
* Microsoft Security Essentials - a free download (even SMEs can use it on up to 10 PCs for free) and actually does its job quite unobtrusively and is lightweight too.
* Daemon Tools Lite - useful for mounting ISOs as a drive (amongst other features). Bizarre that Windows 7 *still* can't do this, ho hum.
* Mozilla Firefox or Google Chrome - anything but IE, surely?!
* ImgBurn - again, does a lot more than the standard CD/DVD burning stuff baked into Win 7.
* puTTY and/or FileZilla - essential tools if you ever have to transfer files or login remotely to another machine that isn't running Windows (yes, shock, there are non-Windows machines out there).
* VirtualBox - so you play with VMs (often running Linux) to see what "real" operating systems are like :-)