Useful Software

LastPass

http://lastpass.com/

Password manager. Can be made mobile (iPhone and Android apps) through the Premium Edition subscription.

PuTTY Connection Manager

http://puttycm.free.fr/cms/

Allows you to manage multiple PuTTY connections with auto-login, with passwords being stored in an encrypted database file. Perfect if Mr Security has had his way in your organisation and your servers have varying, complex passwords.

RealVNC

http://www.realvnc.com

The original VNC. Probably the best remote admin console software there is, once you've worked in an environment that uses VNC properly it'll kill you to have to go back that out of the box limited RDP rubbish.

Its killer feature has to be the ability to copy and paste (binary) files from session to session, excellent.

Its not free if you want the bells and whistles, but if you've got a couple of quid left over in your budget at the end of the year, its well work a look.

RVTools

http://www.robware.net/

RV Tools audits your virtual infrastructure and provides a nice diagnosis list, which is more like a to do of background maintenance tasks. Its best feature is probably its ability to identify orphaned files on your datastores which can enable to free up quite a bit of precious SAN space.

Synergy

http://synergy-foss.org/

KVM functionality without a KVM - allows you to control multiple Windows machines from the same keyboard. Ideally suited to when you've more than one desktop machine, but would them to be managed as if they were multiple displays from the same machine.

Windows 7 USB/DVD Download Tool

http://wudt.codeplex.com/

Allows you to create a boot-able USB stick from an Operating System install ISO (eg Win7, Win2k8 etc)

WinImage

http://www.winimage.com/download.htm

CD image extraction and editing software