Firefox, M$ Office (:/), XenCenter, RoyalTS (all on Windows), and misc. Linuxy stuff..
I'm the IT Guy for a small non-profit research and development company in the higher education sector.
Firefox is used for Spiceworks, various web-based management consoles for our storage devices (and webmin on Linux VMs), and general web stuff. M$ Office is mostly just Outlook and Excel. XenCenter to manage our XenServer infrastructure, and RoyalTS is for RDC-ing to various servers and workstations. Most Linux admin is done via webmin, or shell.