Well, there may be more than 170 different iPhone apps that can make rude bodily noises, so virtualization vendors have a ways to catch up there. But there are a few good iPhone apps that are worthy of IT workers' attention.
Wyse has its PocketCloud iphone app, which costs $40 and doesn't have very good documentation and has a confusing series of Web pages. And there are Windows remote desktop clients, VNC clients, and even a Webex and LogMeIn clients too, making remote control of your desktops from your iPhone easier, although scrolling around its miniscule screen can get tiring.
But let's give Citrix kudos for their Citrix Receiver for iPhone app, which is free. You can remotely control a desktop from your iPhone, as well as use it to connect to a XenApp or Presentation server host and run Windows apps. They include a demo system that you can connect to see the various features involved, which is very smart. It comes with a feature called DocFinder, which helps you locate documents on your network servers. You can also host or join Goto Meetings too.
Citrix: A, for reasons above. This is the ideal for other IT iPhone apps. VMware, Microsoft: both get an F, no iPhone apps yet from them.
Virtual server comparison: VMware vs. Microsoft vs. Citrix/Xen