Currently we're using Citrix via Citrix receiver, which isn't terrible.
I know there are other methods, such as parallels, fusion, wine, etc. But I wanted to see what was working best for folks that have to support IE in a Mac environment!
I've used the Citrix, Parallels and Fusion methods in my past environments. We also recycled old PC Dell boxes, pushed out CoRD or Remote Desktop Connection and had users remote into their PC boxes next to their Mac.
Citrix for timesheets (ugh), VMWare for local Windows VMs for the 'everything else' that comes up (namely testing PPT decks for compatibility and the occasional Cisco ASDM session).
